The best wireless pool thermometers, compared.
Top pick: Inkbird IBS-P02R + M2 Best value: Longzhuo 433 MHz – 3.8 from 209 reviews at about £19.99, with a named 433 MHz link and an indoor clock, against the same desk score on a £59.49 solar set. Updated October 2026.
A wireless pool thermometer is a floating sensor plus a way to read it indoors: a local radio monitor, or a Wi-Fi gateway and an app. UK reviews on these amazon.co.uk listings are mostly a garden pool, a hot tub, or a fish pond, checked from the house. A useful set still links through your walls, keeps water out of the float, and runs for more than a few weeks on batteries or solar. A star line is not a life test. The thinnest row is 4.6 from three reviews, and several cheaper rows have UK reviews of failure inside two to four months. Open-air metres are not the range through brick, a cover, or a steel tub. The checks are in the [wireless pool thermometer buying guide](/hub/swimming-pools/wireless-pool-thermometer/sub/wireless-pool-thermometer-buying-guide).
A wireless pool thermometer is a floating sensor plus a way to read it indoors: a local radio monitor, or a Wi-Fi gateway and an app.
41 products checked · 58 hrs invested · +21,400 readers
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Personal buying guide
Question 1 of 2
Where do you want the reading?
This second IBS-P02R plus IBS-M2 listing is about £64.99 with 5.0 from 2 reviews. The bullets describe the same gateway idea as the £59.99 ASIN: IPX7, the Inkbird app and alarms, and up to nine channels. A UK review says it reads a hot tub on the app and on the plugged-in base, which also showed an external temperature, and that it matched a passive floating thermometer over two days. The other stored note says the written instructions made setup harder than the hardware. Open-air range is not printed on this ASIN, and the included line is the pool thermometer and the Wi-Fi gateway, with no charging cable listed. The part number is IBS-P02R+M2-FBAUK. Two five-star reviews do not show how the gateway behaves in a power cut; that complaint sits on the other extracted IBS-M2 set, not in these two texts. At about £64.99 you pay more than the £59.99 listing of the same idea for a much smaller review base.
Pros
Cons
Best for: You specifically want this FBA part number and a hot-tub reading in the Inkbird app, and two reviews are enough for you to try it.
Less suitable: You want the cheaper IBS-M2 listing with 35 reviews, or a printed open-air range.
Specifications
Common questions
How is this different from the other IBS-P02R set?
The bullets describe the same IBS-P02R plus IBS-M2 idea. This ASIN is about £64.99 with two UK reviews. The other extracted ASIN is about £59.99 with 35 reviews. Part number here is IBS-P02R+M2-FBAUK.
Can it show a hot-tub temperature indoors?
A UK review says it reads a hot tub on the app and on the plugged-in base. The base also showed an external temperature in that review.
What is in the box?
Included components: pool thermometer and Wi-Fi gateway. A charging cable is not listed on this ASIN.
The ORIA WA189 is a float and a receiver at about £25.99, listed at 4.6 from 3 reviews. The bullet prints IP68, 100 m in an open area, and water from -19.9°C to 60°C, while the technical upper rating is 70°C. The monitor can run from USB-to-DC or from two AAA cells, and the screen shows pool temperature plus room temperature and humidity. A UK review uses it in a raised fish pond and likes the large display on both the thermometer and the indoor unit; the two units connected quickly. That review also says each end takes two AAA batteries and they are not supplied. The same thin set of notes says the 100 m open-area claim was not the range measured in that house. Included components are the main unit and the floating sensor only. A 4.6 from three reviews is a star line, not a durability record.
Pros
Cons
Best for: A fish pond where you want a large indoor display and you already have AAA cells and a USB lead.
Less suitable: Anyone treating 4.6 from three reviews as proof of a 100 m link through a house.
Specifications
Common questions
Are batteries in the box?
Included components are the main unit and the floating sensor. A UK review says each end takes two AAA batteries and they are not supplied.
Why do the temperature ceilings disagree?
The bullet measures water from -19.9°C to 60°C. The technical upper temperature rating is 70°C. Both figures are printed. They are not averaged.
How solid is the 4.6 score?
The listing says 4.6 from 3 reviews. Two UK reviews are stored: a fish pond with a large display, and a note that 100 m open air was not the range in that house.
The Warmfay is a solar float with battery fallback and a base station you read in the house, at about £26.99 with 4.2 from 158 reviews. The bullet prints up to 70 m, ±1°C, a backlight and up to three sensors, and five AAA batteries are in the included line with a nylon tether and a plastic key. UK notes describe a hot tub readable from inside the house, a large display that was useful at night, and a float that held through splashes and rain. The title says IP68 and a bullet says IPX8, and neither states a depth and a time. The included-components line does not name the base station, even though the bullets and two UK reviews describe a remote. One of the three stored UK reviews says the unit failed completely after six weeks; the 4.2 is from 158 reviews, not from those three texts. Update timing also disagrees: every 58 seconds on the bullet, 30 seconds on the technical line.
Pros
Cons
Best for: You want a solar float and an indoor remote for a hot tub or pool, with batteries in the box, and you can live with the IP-code clash on the listing.
Less suitable: You need the base station named on the included line before you pay, or a single agreed ingress code.
Specifications
Common questions
Is the base station in the included-components line?
No. That line lists the pool thermometer, a nylon tether, a plastic key and five AAA batteries. The bullets and two UK reviews describe a remote you read in the house.
Which IP code is printed?
The title says IP68. A bullet says IPX8. Both are stored. Neither states a depth and a time.
How many of the reviews are from the UK?
The listing score is 4.2 from 158. Only three stored reviews are headed United Kingdom. One of those says the unit failed after six weeks.
The OFFCUP V9 is a float and an indoor host at about £20.99, with 4.2 from 47 reviews. The bullet prints IP68, 50 m, ±1°C and an update every 30 seconds, and the sensor span is -40°C to 70°C. The box line lists the thermometer, the host, a six-country manual and a tie rope. One UK review praises the range and calls it easy, though that review says Bluetooth and the technical line says Wireless. The other two stored UK reviews are short: two units, in a hot tub and a swim spa, were both dead after two months and new Duracell batteries did not revive them, and another unit lasted a week. The 4.2 is the listing total of 47, not those three texts. Item length is printed as 1 cm, which is stored as printed and is not a measured length of the float. You are looking at a local display whose UK notes in this file are mostly early failures.
Pros
Cons
Best for: You want a local host at about £21 and you will check it still works inside the first weeks.
Less suitable: A hot tub or swim spa you expect to monitor for a whole season on the UK notes in this file.
Specifications
Common questions
What is in the box?
Included components: pool wireless thermometer, host, a six-country manual and a tie rope.
Why is the length 1 cm?
The technical line prints item length as 1 centimetre. That figure is stored as printed. It is not a measured length of the float.
What do the UK reviews in the file say?
Three UK reviews are stored. One praises range. One says two units, in a hot tub and a swim spa, were both dead after two months. One says it lasted a week. The 4.2 score is the listing total of 47, not those three texts.
The Inkbird IBS-P05R is a solar float with an indoor receiver at about £59.49, with 4.0 from 115 reviews. The bullet prints -40°C to 70°C, IP68 and an open-air range of 300 m / 980 ft, and two AAA batteries are included. UK reviews use the remote so they do not walk down the garden, and one credits solar charging for not making batteries a weekly job, plus an ambient light in the evening. The technical connectivity line says Bluetooth, while one UK review mentions an app and a Wi-Fi channel; those statements are both in the extract and are not reconciled. Another review says it will not perform with no sun and wanted a USB backup, and low sun left the battery hard to fill. The wireless connection died in under 12 months in one UK review, and another found pairing difficult, with the lights still not working. Inkbird support fixed a unit quickly in a separate note. At this price you are paying for solar and a long open-air claim, not for a link type the listing agrees on.
Pros
Cons
Best for: A sunny garden pool where you will pay about £59 to avoid weekly battery changes and you can pair a local receiver.
Less suitable: A shaded pond, or anyone who needs the listing to agree whether the link is Bluetooth, Wi-Fi or an app.
Specifications
Common questions
Is the link Wi-Fi or Bluetooth?
The technical connectivity line says Bluetooth. A UK review mentions an app and a Wi-Fi channel. Those two statements are both in the extract and are not reconciled.
Does it need sun?
The listing says solar powered, with two AAA batteries included. A UK review says it will not perform with no sun and wanted a USB backup.
What arrives in the box?
Included components: pool thermometer, receiver and user manual.
The Inkbird IBS-P01R is a white float and an indoor monitor at about £29.59, with 3.8 from 250 reviews, the largest review count in this set. The bullet prints 90 m, up to three floats and ±1.0°C, and it does not describe an app; a UK review says there is no app function and that the buyer did not need one. Probe range is -40°C to 70°C and the monitor is -10°C to 60°C. UK reviews praise a hot-tub or pond link and say the float and the remote agree with other checks. Across 42 stored UK reviews, batteries are the repeated complaint, including life falling from about a week to under a day with alkaline and rechargeable cells. The technical line requires 4 AAA and they are not in the included components. Transmitters failed after about three or four months, or twice in a year, and Inkbird sent replacements, including more than once for one buyer. Fogging appears in a minority of the UK reviews.
Pros
Cons
Best for: You want a local Inkbird monitor for a pool, hot tub or pond and you will budget for frequent AAA changes.
Less suitable: You want months between battery changes, or a Wi-Fi app and alarms.
Specifications
Common questions
Does the IBS-P01R have an app?
The bullets describe an indoor monitor, not an app. A UK review says there is no app function and that the buyer did not need one.
Are batteries included?
The technical line says 4 AAA batteries are required. Included components list the thermometer and the receiver, not batteries.
What do UK reviews say about battery life?
Across 42 stored UK reviews, batteries are a repeated complaint, including a report of life falling from about a week to under a day. Other UK reviews praise the hot-tub or pond link and Inkbird replacements.
The Longzhuo is a 433 MHz float and an indoor host with a clock, at about £19.99 with 3.8 from 209 reviews. The bullet prints 60 m, IP67 and water from -40°C to 70°C. UK buyers use it so the pond or pool temperature sits on the indoor clock instead of on a float you have to fetch. One review was still working at 11 months, with two AAA cells in the pond unit replaced then, the inside still dry, and a link of about 70 feet through double glazing. The technical line says 1 AAA, which does not match reviews that describe cells in both the float and the indoor unit. The floating sensor eats batteries in several UK reviews, and one sensor display failed at about seven months; that reviewer calls a one-month warranty poor. A hot-tub reading fell from about 40°C to about 28°C within minutes, including in controlled 40°C water, five days outside the return window. One review says the values can be picked up in Home Assistant via RTL-433; that is a review, not a printed feature.
Pros
Cons
Best for: A fish pond or garden pool where you want the number on an indoor clock and you can change batteries.
Less suitable: A hot tub held near 40°C, or a sensor you will not open for new cells.
Specifications
Common questions
What radio does the listing name?
Connectivity is printed as proprietary wireless at 433 MHz, with a 60 m bullet. One UK review says the values can be picked up in Home Assistant via RTL-433. That is a review, not a feature on the bullet.
How many batteries does the technical line require?
The technical line says 1 AAA. UK reviews describe batteries in the float and in the indoor unit, including two AAA in a pond unit that lasted about 11 months.
What failed in UK reviews?
Repeated notes are battery drain in the float, a sensor display that failed after months, and one hot-tub reading that fell from about 40°C to the high 20s. Other UK reviews were still happy at 11 months.
This Inkbird set is the IBS-P02R float plus an IBS-M2 Wi-Fi gateway, at about £59.99 with 3.8 from 35 reviews. The bullet prints IPX7, up to nine floats, 90 m open air and the Inkbird app, with alarms and history. The box lists one thermometer, the gateway, a charging cable and a manual, so the nine-channel line needs extra floats you do not get here. UK reviews describe graphs, threshold alerts and use on a cold pod, a Lay-Z-Spa and a pool, and Inkbird sent a replacement thermometer under a stated two-year warranty after about eight months. The gateway has no onboard battery in those reviews: it must be plugged in, and a short power cut can wipe the configuration. Connection drops are reported so a hot-tub temperature disappears, and one float let water in after a while. Pairing failed for one buyer on both the base and the phone, and the app menus bury the thermometer. The technical upper rating is 100°C; a full water span is not printed, and the bullet accuracy is 1°C.
Pros
Cons
Best for: You want phone alarms for a pool, spa or cold pod and you can leave the gateway on mains.
Less suitable: A house with short power cuts, or a buyer who wants a battery gateway and a simple local screen.
Specifications
Common questions
Does this set use a phone app?
The bullets say the IBS-M2 Wi-Fi gateway works with the Inkbird app, including alarms and history. The included line lists the thermometer, the gateway, a charging cable and a manual.
Will the gateway run on batteries?
The technical power field is blank. UK reviews say the gateway has no onboard battery, must be plugged in, and can lose its configuration in a short power cut.
How many thermometers can it take?
The bullet says up to nine Inkbird pool thermometers. This box lists one thermometer.
The Insoma TS-PL07 is a float and a receiver at about £21.59, with 3.7 from only 3 reviews. The bullet prints IP68, 100 m in an open area, and water from -19.9°C to 60°C. The screen labels under 25°C as COLD, 25–29°C as COMFORT and over 29°C as HOT; those are Insoma's labels, not a pool-operator standard. One UK review uses it so they do not lift a hot-tub cover. Another found it about 0.7°C high against three other thermometers on one day, 27.2°C versus 26.5°C, and still called it well sealed once that bias is allowed for. The third could not connect a garden pond less than 20 feet from a window, with no walls in between. A child lock and a low-battery indicator are named; battery life in days is not. Three reviews cannot tell you whether the 100 m line holds at your house.
Pros
Cons
Best for: You want comfort labels on an indoor screen for a hot tub and you can check the link before the return window closes.
Less suitable: A pond where the receiver sits even a short way from the water, until more than three reviews exist.
Specifications
Common questions
What do the comfort labels mean?
The bullet says under 25°C shows COLD, 25–29°C shows COMFORT, and over 29°C shows HOT. Those are Insoma's labels, not a pool-operator standard.
Did the 100 m claim hold in the UK reviews?
One of the three UK reviews could not connect a pond less than 20 feet from a window. Another uses it so they do not lift a hot-tub cover. The third found it about 0.7°C high against three other thermometers.
Is a child lock printed?
Yes. Special features and the bullet name a child lock and a low-battery indicator. Battery life in days is not stated.
The Aottom set is a float plus a monitoring display, listed at about £17.99 with 3.4 from 189 reviews. The bullet prints IP68, 50 m, ±1°C and three channels, and a water span of -40°C to 70°C. The technical line also says Wi-Fi, but the bullets describe the indoor display, a °C/°F switch and the channels, not an app. Several UK reviews call it easy to set up and accurate enough to replace an 18-year-old in-pool thermometer. Other UK notes say it failed after about two or three months, or showed -9 while the buyer in Essex said it was 16 degrees outside. One hot-tub reading fell from about 40°C to the high 20s within minutes, including in a controlled 40°C check. Tighten the cap before it goes in the water; the IP68 bullet says that, and the rest of the sentence is cut off in the extract. With 189 reviews this is one of the cheaper sets with a real sample, and that sample includes both steady pool use and early failure.
Pros
Cons
Best for: You want a local indoor display for a garden pool at the bottom of this price band.
Less suitable: A hot tub you will trust at about 40°C, or a phone app.
Specifications
Common questions
Does Aottom include a phone app?
The connectivity line says Wi-Fi and wireless. The bullets describe a monitoring display up to 50 m, indoor temperature, a °C/°F switch and three channels. They do not describe an app.
Will it suit a hot tub?
The upper rating is 70°C and the bullet span is -40°C to 70°C. One UK review says a hot-tub reading fell from about 40°C to the high 20s. That is one review, not a test of every unit.
What should you do before it goes in the water?
The IP68 bullet says to tighten the cap before immersing. The rest of that sentence is cut off in the extract.
The Yallmie G2009 is a floating sensor with a separate indoor display, and amazon.co.uk lists it at about £17.79 with 3.1 from 16 reviews. A bullet prints ±1°C and an update every 5 seconds, while the title says up to 60 m and another bullet says 197 feet. The technical line calls the link Bluetooth, and the included-components line names only the floating thermometer. UK reviews that worked describe a hot tub talking to a display 10–15 m away as soon as the batteries were fitted, and a pond reading that moved more than the buyer expected. The same file also records units that stopped showing a temperature after about three weeks, or died at about two months, including a second cold-plunge unit. The seller was described as unreachable after a sensor display failed while the remote still received. At this price you are buying a short trial of a house display, not a season of readings you can plan around.
Pros
Cons
Best for: You want a cheap indoor readout for a nearby hot tub or pond and you can return it if it dies inside a month.
Less suitable: You need a thermometer that is still working after a couple of months, or a printed IP rating.
Specifications
Common questions
Does the included-components line list the indoor monitor?
No. It says pool thermometer floating. The bullets describe an indoor monitoring display. UK reviews describe a separate display in the house.
What range is printed?
The title says up to 60 m. A bullet says up to 197 feet. Connectivity on the technical line is Bluetooth.
How did the 14 UK reviews read?
Some worked immediately for a hot tub at 10–15 m or for a pond. Several describe failure or wrong readings at three weeks, about two months, or after a second unit lasted about two months in a cold plunge.
The Inkbird IBS-P03R with the IM-03 gateway is listed at about £63.74 and the extract has no Customer Reviews line and no review text. The bullet says 2.4 GHz Wi-Fi, an app, IP68, solar power, up to nine channels and 300 m / 980 ft open air between the thermometer side and the gateway. The box contains one pool thermometer, one gateway and a user manual, plus one nonstandard battery that is included. A water-temperature span is not printed. The sales rank sits in Health & Personal Care, 138 in Baby Thermometers, while the title names swimming pools, an ice bath and the IM-03, and the age-range field says Adult. There is no UK review here of pairing, sun, or how long the float stays dry. Treat the shelf price as the figure in the extract, not as a tested product. The desk score of 30 means missing reviews, not zero stars.
Pros
Cons
Best for: You are comparing the printed IM-03 spec with the other Inkbird gateways and you will wait for reviews before relying on it.
Less suitable: Anyone who wants amazon.co.uk reviews of accuracy, range through a house, or how long the float lasts.
Specifications
Common questions
Are there any amazon.co.uk reviews in the extract?
No. There is no Customer Reviews line and no review text. The price in the extract is about £63.74. Do not treat the missing line as zero stars.
Which Wi-Fi band does the bullet name?
The bullet says 2.4G Wi-Fi, with an open-air range up to 980 ft / 300 m between the thermometer side and the gateway claim.
Why is the sales rank under baby thermometers?
The extract ranks it in Health & Personal Care, 138 in Baby Thermometers. The title still names swimming pools, an ice bath and the IM-03 gateway. The age-range field says Adult.
Shelf prices, stars, and review counts are the amazon.co.uk extracts for these twelve listings, captured on 15 October 2026. The score on each card runs from 0 to 100. It starts from the star line, then takes off points for a thin review count, for UK review notes of early failure, and for two printed figures that disagree. A listing with no Customer Reviews line stays at a spec-only 30, which means missing reviews. Price does not add points. It only decides the best value. Nothing here is a laboratory test.
Link type
25%A local indoor monitor is a different product from an Inkbird Wi-Fi gateway, which needs mains and 2.4 GHz. A printed Wi-Fi line counts as an app only when the bullets say app.
Open-air range and the house
20%Bullets state 50 m to 300 m in open space. Brick, a cover, and a steel tub are not in those sentences, so the metre figure is not scored as indoor range.
Upper temperature
20%Hot-tub decisions sit near 36–40°C. The bullet range and the technical upper rating are both kept. Figures that disagree are not averaged.
Power and the box line
20%Batteries, a solar panel, and the indoor unit count only when the included-components line or the bullets name them. A gateway with no battery can lose its setup in a power cut.
Ingress and review base
15%IPX7 is 1 m for 30 minutes. Digit 8 needs the maker's depth and time. Stars and review volume stay in the score, with a cap when fewer than 10 reviews are on the listing.
Start with the link, then the walls between the float and the screen, then the upper temperature and what is actually in the box. A star rating does not tell you those four. The twelve listings are amazon.co.uk pages captured on 15 October 2026, not a live reload and not a laboratory test. Entry prices sit near £18. Gateway sets sit near £60. Open-air metres, a Wi-Fi word, and an IP68 bullet each need a second look before you treat them as a season of readings.
A wireless pool thermometer in this comparison is a floating sensor plus a way to read it indoors. That second part is either a local radio monitor or a Wi-Fi gateway and an app. UK buyers on these amazon.co.uk extracts are mostly watching a garden pool, a hot tub, or a fish pond from the house. Quality shows up as a link that still works through the actual walls, a float that does not fog or ship water, and batteries or a solar panel that last more than a few weeks.
Bullets state 50 m to 300 m in open space. Brick, a cover, and a steel tub are not in those sentences. One Insoma UK review failed under 20 feet. One Longzhuo UK review held through glazing at about 70 feet for 11 months. Test the link at your house before the return window closes.
Aottom prints Wi-Fi and Wireless, then describes a local display, a °C/°F switch and three channels. The bullets do not describe an app. Yallmie and the IBS-P05R print Bluetooth beside a long-range or app claim. Count an app only when the bullets name one, as they do on the IBS-M2 and the IM-03.
IPX7 is 1 m for 30 minutes under BS EN 60529. Digit 8 needs the maker's depth and time. Warmfay's title says IP68 and a bullet says IPX8, and neither states a depth and a time. An ingress code is not a warranty against chlorinated water, fogging, or a float that fails after two months.
A local indoor monitor is a different product from an Inkbird Wi-Fi gateway. Longzhuo prints 433 MHz. Aottom prints Wi-Fi and Wireless and then describes a local display, a °C/°F switch and three channels, not an app. Yallmie and the IBS-P05R print Bluetooth beside a long-range or app claim that the bullets do not fully match. The IBS-M2 and the IM-03 are the gateway sets: mains, 2.4 GHz, and an app named on the bullet. Open-air bullets in this set run from 50 m to 300 m.
Hot-tub decisions sit near 36–40°C. Several bullets go to 60°C or 70°C. The IBS-P02R technical upper rating is 100°C, and a full water span is not printed on that listing. A reading that falls away in a UK review, including from about 40°C into the high 20s on Longzhuo and Aottom, is one review, not a test of every unit. How hot to run the tub is a separate choice from which float you buy: see [safe hot tub temperature](/hub/swimming-pools/blog/safe-hot-tub-temperature).
Three typical situations, each with a recommendation from this comparison.
You want the pool temperature on a screen indoors before you get changed. The Warmfay solar remote is the top pick, at about £26.99, with 4.2 from 158 reviews, five AAA cells in the box, and a backlight. The title and a bullet disagree on IP68 and IPX8.
You are tired of opening the cover to see the number, and the water sits near 38–40°C. The Inkbird IBS-P01R is a local monitor at about £29.59, with 3.8 from 250 reviews and UK notes of hot-tub readings that matched other checks. Budget for frequent AAA changes.
You use the reading for feeding and you can change batteries. The Longzhuo 433 MHz set is the best value at about £19.99, with 3.8 from 209 reviews. One UK pond unit was still working at 11 months. It is a poor fit for a hot tub held near 40°C.
The top pick is the Warmfay solar remote, at about £26.99, with 4.2 from 158 reviews, five AAA batteries listed in the box, a backlight, and up to three sensors. The score still comes down for an IP68 and IPX8 clash, a base station missing from the included line, and one stored UK review of failure after six weeks. The best value is the Longzhuo 433 MHz set, at about £19.99, with 3.8 from 209 reviews, a named 433 MHz link, and an indoor clock. The Inkbird IBS-P05R reaches the same desk score at about £59.49, so it is not the value pick. A Wi-Fi gateway is a different product: it needs mains, and UK reviews say a short power cut can wipe the setup.
Longzhuo 433 MHz
3.8 from 209 reviews at about £19.99, with a named 433 MHz link and an indoor clock, against the same desk score on a £59.49 solar set.
Editorial
Peter F. is the editor for DIY & tools at productscompared.co.uk. Comparisons in this category are checked against amazon.co.uk listings, review evidence and public UK sources.
Guides on what to look for, how to use a product, and common mistakes.
Public UK sources for pool and spa temperatures, 433 MHz short-range devices, radio equipment marking, the 30-day right to reject, and IP codes. Listings are the amazon.co.uk captures for these twelve ASINs on 15 October 2026, not a live reload. Prices on amazon.co.uk move.
This page contains affiliate links to amazon.co.uk. If you buy through them, we may earn a commission at no extra cost to you. Prices, stars, and review counts come from those listings. We did not run a laboratory test. The scores rank a listing inside this set only.
