The best Soil moisture sensors, compared.
Top pick: XLUX soil moisture meter (no batteries) – Highest score among moisture-first finished meters with a large UK review sample: 88, at about £9.99, with 4.4 from 65,286 reviews on a battery-free dial. Best value: Sonkir MS02 3-in-1 soil moisture meter – Score 80 at about £9.99, with 4.0 from 45,448 reviews. Moisture is the useful channel, and the pH dial stays a hint. Updated October 2026.
A soil moisture sensor tells you whether the root zone is dry enough to water. In the UK you buy one for houseplants, pots and beds before you water, especially in a dry spell. The figure is relative. Soil type and salts change it. It is not laboratory volumetric water content. You recognise a suitable soil moisture sensor by the job, the probe and the power. A spot-check meter is pushed in, read, wiped and stored. A stay-in probe can remain buried. That suits a capacitive design, not a metal fork that corrodes. A passive colour window gives no percentage. A DIY module needs your own calibration. Cheap probe pH is not a reason to dose lime or sulphur. Match probe length to the pot, and do not force a tip into stony ground. A sensor does not make a hosepipe legal in a temporary use ban. It only times water you may use. The checks are in the [soil moisture sensor buying guide](/hub/garden-watering/soil-moisture-sensor/sub/soil-moisture-sensor-buying-guide).
A soil moisture sensor tells you whether the root zone is dry enough to water. In the UK you buy one for houseplants, pots and beds before you water, especially in a dry spell. The figure is relative.
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Personal buying guide
Question 1 of 2
How will you use it?
Across 65,286 amazon.co.uk reviews at 4.4 stars, the XLUX soil moisture meter is the clearest moisture-only spot-check tool in this set. You push the single metal probe into pot or bed soil, read a dry, moist or wet dial, then wipe and put it away. No batteries at any stage. On this capture it sits at about £9.99, in the entry band alongside the multi-function dials. Reviewers like the large dial and the gentler single probe around roots, and they use it indoors and outdoors. The listing and review themes both warn you not to leave the tip buried more than a few minutes, because the metal corrodes and the reading drifts. It will not read in pure water tests and can bend if you force it into hard or stony ground. Treat the scale as a relative watering guide, not a laboratory volumetric water content figure. Skip it if you need stay-in alerts, Zigbee automation, or a microcontroller output. The score is 88. It is the top pick among moisture-first finished meters with a large UK review sample.
Pros
Cons
Best for: You want a battery-free moisture-only spot-check for houseplants and garden pots and will wipe the probe after each reading.
Less suitable: You need a probe that stays buried, smart alerts, or a DIY module output.
Specifications
Common questions
Do I need batteries?
No. This XLUX meter is battery-free on the listing. You insert the probe, read the dial, wipe it and put it away.
Can I leave it in the pot?
Not for long. The listing warns against leaving the metal tip in soil more than a few minutes, because the tip corrodes and the reading drifts.
What does the dial show?
A dry, moist or wet moisture scale for pots and garden soil. It is not a laboratory volumetric water content percentage.
Hilitand's FS400-SHT3X probe packages a digital temperature and humidity sensor in a stainless and plastic shell with I2C output for microcontroller projects. On this capture it is about £17.56 with 4.4 stars from only seven amazon.co.uk reviews, a thin sample despite the strong star average. The listing claims a dustproof shell, and the module is powered by the host rather than product batteries. Weight is listed at 84 g. An upper temperature figure printed in Fahrenheit on the capture is a reminder to check units in your code. This is a soil-climate probe for builders, not a dry, moist or wet dial for casual watering decisions. Evidence for everyday UK gardeners is too thin to put it ahead of the XLUX or Sonkir meters. The score is 88 on the star line, the same number as the top pick, but the seven-review I2C job is why the badge stays on the moisture-only dial. Choose it when you already use I2C and want temperature and humidity in soil.
Pros
Cons
Best for: You build microcontroller soil-climate projects and need an I2C temperature and humidity probe in a shelled body.
Less suitable: You want a houseplant dial, Zigbee stay-in moisture, or a large UK review sample.
Specifications
Common questions
What does it output?
I2C digital temperature and humidity from an SHT3X-class probe, per the title. It is not a dry, moist or wet watering dial.
Are batteries included?
No. The probe is powered by the host microcontroller, not by cells in the box.
Outdoor use?
The listing claims a dustproof stainless and plastic shell. Review evidence on this capture is thin: 4.4 from seven amazon.co.uk reviews. Check temperature units in your code.
The YAMRON 4-in-1 is a backlit handheld that claims moisture, pH, temperature and light on one metal-probe body at about £19.99. The saved listing shows 4.3 stars from 215 amazon.co.uk reviews, a useful mid-size sample for a digital multi-meter in this set. Reviewers like the large screen and say moisture and temperature help them decide when to water outdoor and indoor plants. You must buy 4× AAA cells yourself. They are not in the box on this capture. A minority report stuck or inaccurate pH and moisture readings, and some see temperature in Fahrenheit when they expected Celsius. Treat every channel as a relative guide, especially pH. The listed package size is about 4 × 6 × 32 cm at 130 g, so it is a proper handheld rather than a slim stick. It sits above the battery-free dials on price and below the 7-in-1 sibling on feature count. The score is 86. Choose it when you want a lit screen and accept the battery cost. Choose the XLUX or Sonkir dial when you only need moisture.
Pros
Cons
Best for: You want a digital spot-check with a backlight and will budget four AAA cells before first use.
Less suitable: You refuse batteries, need laboratory pH, or only want a simple moisture dial.
Specifications
Common questions
Does this meter need batteries?
Yes. The listing notes 4× AAA cells, and they are not included. Budget those cells before the first reading.
What does the 4-in-1 measure?
The listing describes soil moisture, pH, temperature and sunlight on one handheld unit. Treat each channel as a relative guide, especially pH.
Is it only for indoor plants?
No. The listing positions it for outdoor plant care as well as indoor use. It is a spot-check, so wipe the metal probe and do not leave it buried.
SUStee's set of five watering indicators is a different job from a numeric meter. Each stick stays in the pot and shows a colour window when watering is due. On this capture the green medium five-pack is about £24.30 with 4.2 stars from 2,912 amazon.co.uk reviews, a strong sample for a passive indicator. Reviewers like the minimal look, the lack of batteries, and having five units for a windowsill of plants. The medium size must match pot depth. Wrong sizing for very small or very deep pots is a recurring complaint. It is not a calibrated percentage instrument and will not feed Zigbee automations. International seller terms appear on some captures, so check the live listing for fulfilment before you buy. Use these when you want a glanceable stay-in reminder rather than a dial you insert and remove. Pair with a spot-check meter if you also want a numeric cross-check in beds. The score is 84.
Pros
Cons
Best for: You keep several houseplants and want stay-in colour reminders without batteries or apps.
Less suitable: You need a dial reading, bed monitoring, Zigbee alerts, or DIY module outputs.
Specifications
Common questions
Does SUStee need batteries?
No. It is a passive watering indicator with no batteries. The colour window stays in the pot.
How many are in the box?
This listing is a set of five, green medium size. The medium length has to match the pot depth.
Is it a numeric moisture meter?
No. It is a glanceable colour-window indicator, not a dial or a percentage meter, and it does not feed a Zigbee hub.
Hailege's two-piece LM393 kit pairs resistive soil forks with relay modules and Dupont wires for about £7.49. The saved listing shows 4.2 stars from only 12 amazon.co.uk reviews, so the sample is small. The pack is aimed at learning projects that switch a load when a moisture threshold is crossed, with module supply up to 12 V on the listing. Reviewers like having probes, modules and wires in one box for short demos. Resistive forks corrode and drift if you leave them powered in damp soil, which is why this set belongs in the short-demo column next to capacitive DIY packs. It is not a garden stay-in meter and not a houseplant dial. Use it to learn comparator and relay wiring on the bench. Move to capacitive modules or a finished Zigbee sensor for beds. Keep expectations aligned with a learning kit, not a watering product for a temporary use ban. The score is 84.
Pros
Cons
Best for: You want a cheap resistive fork and relay kit for short microcontroller demos and learning.
Less suitable: You need a probe that stays in a bed, a capacitive DIY pack, or a finished plant meter.
Specifications
Common questions
What is included?
Two LM393 soil moisture relay modules with probes and Dupont wires, per the title. It is a learning kit, not a finished plant meter.
Good to leave in a garden bed?
Treat it as a short demo. Resistive forks corrode and drift if you leave them powered in damp soil. Use a capacitive board if the probe must stay buried.
Are batteries included?
No. The module is powered from your supply, up to 12 V on the listing, not from cells in the box.
YAMRON's 7-in-1 stretches the same digital handheld idea into fertility, EC and TDS claims as well as moisture, pH, temperature and light. On this capture it is about £26.99 with 4.1 stars from 109 amazon.co.uk reviews, the dearest consumer multi-meter in the set. Reviewers who get past the button sequences value the backlit screen and use fertility as a rough feed cue rather than a compost lab result. Batteries are again 4× AAA and not included, which several buyers flag as annoying at this price. The instruction booklet is called hard to navigate for the button sequences if you only use the meter occasionally. Absolute accuracy is doubted in the same way as other cheap multi-probes. Moisture for watering remains the channel you can act on most safely. Dimensions match the 4-in-1 sibling at about 32 cm tall. The score is 82. Buy it only if one screen of relative numbers is worth the premium over a £10 dial. Do not dose lime, sulphur or fertiliser from these readings alone.
Pros
Cons
Best for: You want one digital screen of relative soil cues and accept battery cost plus guide-only accuracy.
Less suitable: You need a cheap moisture-only dial, stay-in smart alerts, or a laboratory soil test.
Specifications
Common questions
Does it include batteries?
No. The listing records 4× 1.5 V AAA cells as required, and they are not in the box.
What is the 7-in-1 claim?
The listing groups moisture, pH, temperature, light, fertility, EC and TDS. Moisture is the channel to act on. Do not dose lime, sulphur or fertiliser from the other figures alone.
Can you read it in the dark?
The listing claims a white LCD backlight for low light. Reviewers who use it occasionally also call the button sequences hard to remember.
APKLVSR's five-pack of capacitive hygrometer modules is the practical DIY bury option in this set for Arduino and Raspberry Pi builders. On this capture it is about £7.99 with 4.1 stars from 54 amazon.co.uk reviews. Boards are listed at 98 mm × 23 mm with a 3-pin analogue header, so you wire them to your own microcontroller supply rather than treating them as a finished garden gadget. Reviewers call most units solid for the price and value the five-pack, which matches capacitive advice for longer soil contact versus resistive forks. Some packs still include a dead-on-arrival board, and a few reviews raise 3.3 V reliability doubts on NE555-style variants. Expect to calibrate wet and dry endpoints yourself. This is not a dial for beginners and not a Zigbee sensor. The score is 82. Choose it when you can wire a board and want capacitive probes. Choose the Hailege kit only for short resistive demos.
Pros
Cons
Best for: You build Arduino or Raspberry Pi soil projects and want capacitive probes you can leave in damp soil longer than resistive forks.
Less suitable: You want a ready-to-use dial, a Zigbee stay-in sensor, or a plug-and-play houseplant gadget.
Specifications
Common questions
How many modules are in the pack?
Five capacitive hygrometer modules, listed at 98 mm × 23 mm with a 3-pin header. You supply the microcontroller.
Arduino and Raspberry Pi?
Yes. The listing targets those platforms for an analogue reading. You still calibrate wet and dry endpoints yourself.
Better than resistive forks for burying?
Capacitive designs are the ones intended for longer soil contact. Resistive forks corrode if they stay powered in damp soil.
Sonkir's MS02 is the familiar analogue 3-in-1 many UK buyers already know, at about £9.99, with 4.0 stars from 45,448 amazon.co.uk reviews on this capture. You switch between moisture, light and a claimed pH channel without fitting batteries. Reviewers mainly praise the moisture reading for stopping overwatering on houseplants and for quick garden checks. The light and pH channels get far less trust. Review themes say probe pH often disagrees with chemical kits and shop prices, so treat acidity as a hint at best. Some buyers also note they have seen similar dials cheaper in store. Dimensions on the listing are about 29 cm long and 82 g, so it reaches into typical pots without looking like a lab instrument. Use it when you want one cheap tool that answers whether to water, more than whether to lime. Leave the metal probe out of the soil between checks. The score is 80. It is the best value: the strongest cheap 3-in-1 review line once the top pick is the moisture-only dial.
Pros
Cons
Best for: You want a low-cost 3-in-1 dial and will decide watering from the moisture channel only.
Less suitable: You need trustworthy soil pH for liming, stay-in monitoring, or a moisture-only dial without extras.
Specifications
Common questions
Does the Sonkir MS02 need batteries?
No batteries are required on this analogue 3-in-1 listing. You switch the dial between the claimed channels and wipe the probe after the check.
Can it measure acidity?
It includes a pH function, but review themes treat probe pH as less trustworthy than the moisture channel. Do not dose lime or sulphur from that dial alone.
Indoor and outdoor?
Yes. The title states garden, lawn, farm, indoor and outdoor use. It is still a spot-check, so do not leave the metal probe buried between readings.
TLLTKOK's analogue 3-in-1 is the cheapest dial-style tester in this set at about £8.99, with no batteries required. The saved listing shows 3.9 stars from only 20 amazon.co.uk reviews, so the sample is far thinner than Sonkir's tens of thousands. The title claims moisture, pH and illumination for indoor and outdoor garden use. The listing dimensions include a short side of about 10 cm. Praise in the thin sample centres on portability and the battery-free design. Accuracy comments are mixed, and the pH channel deserves the same distrust you apply to other cheap probe meters. It can fill a first check of whether to water if you already understand relative dials, but it is not a precision instrument and not a stay-in sensor. Prefer Sonkir or XLUX when you want a large UK review line behind a similar job. Keep the metal probe out of the soil between readings. The score is 78.
Pros
Cons
Best for: You want the cheapest battery-free 3-in-1 and will treat readings as rough guides.
Less suitable: You want a large UK review sample, moisture-only clarity, or smart stay-in alerts.
Specifications
Common questions
Does it need batteries?
No. The title says no battery is required for this analogue 3-in-1. Wipe the metal probe after each check.
Indoor and outdoor?
Yes. The title states indoor and outdoor garden use. The review sample on this capture is only 20 reviews at 3.9 stars.
Which readings does it offer?
Moisture, pH and illumination, per the listing. Treat pH as a hint. The moisture channel is the one to use for a watering decision.
Alitamei's 5-in-1 backlit soil tester sits at about £15.99 between the battery-free dials and the dearer YAMRON handhelds. The review line on this capture is only 3.7 stars from four amazon.co.uk reviews, so evidence is thin compared with XLUX or Sonkir. The listing asks you to insert about 10 cm, wait roughly ten seconds, then read moisture, pH, temperature, light and fertility. The few reviewers who comment like a moisture percentage versus a finger on the surface and use fertility as a rough feed cue. They also say fertility often only shows a vague normal, the fixed screen angle forces kneeling, and batteries are not included. At this price the thin sample is the main risk. You are paying mid-band money without the review depth of the dial meters. Treat it as a digital spot-check with little UK evidence, not as a proven pick. Wipe the metal probe after use and do not leave it buried. The score is 74.
Pros
Cons
Best for: You want a mid-price digital multi-meter and accept a very small UK review sample.
Less suitable: You need a deep review sample, no batteries, or a moisture-only dial with a large UK file.
Specifications
Common questions
Does it measure sunlight?
Yes. Light intensity is one of the five listed functions, with moisture, pH, temperature and fertility. The review sample on this capture is four reviews.
Are batteries included?
No. The listing marks batteries as not included. The screen is backlit, and reviewers say the angle is fixed.
How deep do you insert the probe?
The listing says about 10 cm (4 in), then wait roughly 10 seconds. Do not leave the metal probe buried after the reading.
THIRDREALITY's Gen2 Zigbee soil moisture sensor is the stay-in capacitive pick in this set if you already run a compatible hub. On this capture it is about £19.99 with 3.6 stars from 227 amazon.co.uk reviews, a thinner and more mixed sample than the spot-check dials. Reviewers who pair it with Home Assistant ZHA or Zigbee2MQTT often report consistent capacitive readings and useful irrigation automations, with solid life from an AA or lithium AA cell. The listing is clear that a Zigbee hub is required, including SmartThings, Hubitat, certain Echo devices and similar, so budget the hub if you do not already own one. Criticisms cluster around hub-cost surprise, a tall above-soil stem that looks awkward in small houseplants, and a PCB stem that can snap if kicked in a bed. Some users also mix up humidity and moisture values in their dashboard. It is a garden-oriented capacitive body, not a battery-free pocket dial. The score is 72. Skip it if you only need occasional spot-checks. If you automate from it, set a maximum runtime so a valve cannot stick open.
Pros
Cons
Best for: You already own a Zigbee hub and want continuous capacitive moisture for beds or larger pots.
Less suitable: You have no hub, only need occasional spot-checks, or want a pocket dial under £10.
Specifications
Common questions
Do I need a hub?
Yes. The title states a Zigbee hub is needed, such as SmartThings, Hubitat, Home Assistant, certain Echo devices and similar. The sensor price does not include that hub.
Is the probe capacitive?
Yes. The listing emphasises capacitive moisture monitoring for stay-in use, which is the probe class meant to remain in soil.
Works with Alexa?
The listing names Alexa among supported assistant paths once the Zigbee bridge is in place. Without that bridge, it is not a standalone dial.
XuanQiMY's five capacitive v1.2 modules undercut the APKLVSR pack at about £7.59 on this capture, again aimed at Arduino and Raspberry Pi analogue projects. The saved listing has no customer-review line and no review bodies, so the score stays at 0 and you are buying on listing text alone. The boards are small, about 2.9 × 9.7 × 1 cm and 20 g on the pack line, and powered from the host supply, not from product batteries. The listing raises calibration and submersion without a step-by-step procedure or an IP rating, so treat waterproofing and wet and dry calibration as your own work. Capacitive construction is still the right technology class for a longer bury than resistive forks. Without UK review evidence, this is a speculative DIY spare pack rather than a proven garden tool. Prefer the APKLVSR five-pack if you want at least a modest review line behind a similar job. Do not buy it expecting a finished plant meter out of the box.
Pros
Cons
Best for: You already know how to wire and calibrate capacitive modules and accept no review history on this ASIN.
Less suitable: You need UK review evidence, a ready meter, or a Zigbee sensor with an app path.
Specifications
Common questions
What is in the pack?
Five capacitive analogue soil moisture sensor boards aimed at Arduino and Raspberry Pi. This capture has no amazon.co.uk review line, so the score is 0.
Does it need batteries?
No product batteries. The module is powered from your microcontroller supply.
Is it calibrated out of the box?
The listing does not give a step-by-step calibration or an IP rating. Expect to set wet and dry endpoints yourself, and do not assume it is waterproof.
Twelve amazon.co.uk soil moisture sensors are on this page. There is no laboratory test. Stars, counts, prices and review notes come from the saved listings. The score is stars out of 50, review volume out of 25, job fit out of 15, and honest extras out of 10. A listing with no customer-review line scores 0. Price is not inside the score. The top pick is the XLUX soil moisture meter, score 88, the highest score among moisture-first finished meters with a large UK review sample. Hilitand also scores 88, from seven reviews on an I2C job, so that badge stays on the XLUX meter. Best value is the Sonkir MS02, score 80. Limits such as a metal probe that must not stay buried, or a hub you still have to buy, stay in the assessment. They are not a second hidden score.
Amazon star rating
50%Star points are the amazon.co.uk rating divided by 5, times 50, when a review line exists. A 4.4 line is 44 points. If the saved listing has no customer-review line, the whole score is 0.
Review sample
25%Volume points use a log scale of the amazon.co.uk review count, up to about 10,000 reviews, with a maximum of 25. A 4.4 from seven reviews is not treated as stronger buyer evidence than a 4.4 from tens of thousands.
Job fit
15%The probe has to match the listing job: a spot-check dial, a stay-in capacitive sensor, a passive indicator, or a DIY module. Those are not one product type, so they are not scored as if they were.
Honest extras
10%Points reward a clear moisture channel. There is a soft penalty when pH, light or fertility are marketed harder than the review evidence supports. Price is not inside the score.
A soil moisture sensor has to match the job before the extra dials matter. Spot-check, stay-in and DIY boards are different tools. Prices and stars below are the saved amazon.co.uk lines for these twelve listings, not a laboratory test.
A soil moisture sensor is any probe or meter that tells you whether the root zone is dry enough to water. UK buyers use them for houseplants, for pots, and for allotment beds before they water from a can or a water butt. Readings are relative. Soil type and salts move the number. A consumer meter is not laboratory volumetric water content, and a percentage on a screen is not an absolute figure you can compare across composts. The job comes first.
Moisture is the channel to act on. Light, pH and fertility on a cheap multi-meter are hints. Do not dose lime or sulphur from the pH dial alone.
A metal spot-check tip and a resistive fork corrode and drift if they stay in damp soil. Leave a probe buried only when the listing is capacitive or a passive indicator.
A temporary use ban typically stops hosepipes for garden watering. A sensor does not make that use legal. Cans and buckets are usually still allowed. Check your water company notice.
The first check is the job, not the number of functions on the box. A spot-check meter is for an occasional reading in a pot or a bed. You insert it, read it, wipe it and put it away. Many analogue dials need no battery. A digital handheld adds a screen and usually needs cells you buy separately. A passive indicator stays in the pot and shows a colour window, not a percentage. A smart sensor stays in the soil and reports to a hub. A DIY module is a bare board.
Count what the tool needs before it can work. No battery, AAA or AA cells, a Zigbee hub, or a microcontroller supply are different bills. A hub you do not own can cost more than the sensor. Moisture is the channel to act on. Light, pH, fertility, EC and TDS on cheap multi-meters are optional, and the pH channel is a hint. Do not dose lime or sulphur from it alone. If a listing has no customer-review line, this comparison scores it at zero rather than guessing.
Three typical situations, each with a recommendation from this comparison.
You want to stop overwatering pots and you will wipe the probe after each reading. The XLUX soil moisture meter is the top pick: about £9.99, 4.4 from 65,286 amazon.co.uk reviews, score 88. It is a battery-free moisture-only dial. Do not leave the metal tip buried.
You check several spots before you use a can or a water butt. The Sonkir MS02 is the best value: about £9.99, 4.0 from 45,448 amazon.co.uk reviews, score 80. Decide from the moisture channel. Treat the pH dial as a hint, not a lime dose.
You want a capacitive probe that stays in a bed or a larger pot. The THIRDREALITY Zigbee soil moisture Gen2 is about £19.99, with 3.6 from 227 reviews and a score of 72. The listing requires a Zigbee hub. Skip it if you only need an occasional dial reading.
The top pick is the XLUX soil moisture meter at about £9.99. The score is 88, from 4.4 and 65,286 amazon.co.uk reviews, on a battery-free moisture-only dial you insert, read and wipe. Hilitand also scores 88, but from only seven reviews on an I2C temperature and humidity probe, so the badge stays with the XLUX meter. The best value is the Sonkir MS02 at about £9.99, score 80, with 4.0 from 45,448 reviews. Moisture is the useful channel, and the probe pH is a hint. Neither score is a laboratory test.
XLUX soil moisture meter (no batteries)
Highest score among moisture-first finished meters with a large UK review sample: 88, at about £9.99, with 4.4 from 65,286 reviews on a battery-free dial.
Sonkir MS02 3-in-1 soil moisture meter
Score 80 at about £9.99, with 4.0 from 45,448 reviews. Moisture is the useful channel, and the pH dial stays a hint.
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 temporary use bans, product marking and the limits of cheap meters. amazon.co.uk prices, stars and review counts are the saved listing lines for these twelve products. Last reviewed 22 October 2026.
This page contains affiliate links to amazon.co.uk (tag pcuk26-21). If you buy through them, we may earn a commission at no extra cost to you. Prices, stars and review counts are the UK listing lines captured for these twelve products. We did not run a laboratory test.
