The best hay moisture meters, compared.
Top pick: Kalageen TK100H – Highest score in the set: a hay-tester title, a stated 0–80%, and 4.3 from 63 ratings. The written reviews are marked United States or Canada. Not a lab test. Best value: Yosoo Health Gear hay probe – Best value at about £24.18: hay and straw in the title, backlight and voice, and 3.6 from 4 ratings. No stated moisture range. Updated October 2026.
A hay moisture meter is a handheld probe you push into a bale to judge whether the hay is dry enough to stack in a UK barn. Horse owners, small haymakers and contractors use one because damp hay can heat and catch fire. You want a hay or straw scale. Grain is often checked in a cup or a cell. Baled hay needs a prod that reaches past the dry face. Trade probes are commonly about 48 to 50 cm. A parcel of about 43 to 49 cm is the box, not the needle. Above about 30%, public manuals treat the reading as very wet. Take several readings, because one poke can miss a wet core. Fire services in England and Wales treat hay stacked above about 22% as more likely to heat. A common guide keeps small rectangular bales at or below 18–22% and large bales at or below 16–18%. No British Standard for these meters turned up in the sources used here. The order of the checks is in the [hay moisture meter buying guide](/hub/measuring-equipment/hay-moisture-meter/sub/hay-moisture-meter-buying-guide).
A hay moisture meter is a handheld probe you push into a bale to judge whether the hay is dry enough to stack in a UK barn. Horse owners, small haymakers and contractors use one because damp hay can heat and catch fire.
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Personal buying guide
Question 1 of 2
What does the title need to say?
The Kalageen TK100H is the listing in this set whose title is a hay moisture tester, for forage grass, leymus, alfalfa and other hays, at about £76.50. It states a range of 0–80%, accuracy of ±0.5%n, a reading in about one second, and a tote bag. Across the amazon.co.uk line the rating is 4.3 from 63. Reviewers often call it easy and use it before stacking hay they fear will heat. The same file records a low-battery icon that stayed on after the cells were changed, English directions called poor, and dense bales that read 18% when a baler and a laboratory were under 12%. One review says the display stopped near 49.5%. Those texts are marked United States or Canada. In this set it is the top pick because the title is a hay tester and the score is 71 out of 100. That score is not a lab test. It is not a baler sensor.
Pros
Cons
Best for: Someone who wants the listing in this set that is sold as a hay tester, and who will take several readings.
Less suitable: A buyer who needs a printed hay scale with a named probe length, or who will treat one percent as a lab result.
Specifications
Common questions
Which hays does this listing say it measures?
The title says hay, forage grass, leymus chinensis, alfalfa and other hays. A review in the saved listing says you pick a code for the hay type, and that other codes read much too high.
Does the listing include a carry case?
The capability bullet says the meter includes a tote bag. Batteries are required and are not included. The cell type is not stated.
Do the saved reviews treat it as easy to use?
Several reviews call it easy and quick. One says the English directions are extremely poor, and another did not trust the percent while a low-battery icon stayed on. Those reviews are not marked as United Kingdom reviews.
The Yosoo Health Gear listing at about £24.18 puts hay and straw in the title and then lists 14 crops, including wheat, maize, barley, rice and soybean. The amazon.co.uk line is 3.6 from 4 ratings. The only written review, marked United Kingdom on 8 August 2026, says the buyer is happy and does not think the reading is far out. The file does not state a moisture range or an accuracy figure. It does state a backlit LCD, voice in Chinese and English, an anti-slip handle, four AA batteries not included, and auto-off after 15 minutes. The package is 45 x 10 x 5 cm and 315 g. In this set it is the best value because hay and straw are in the title at the lowest shelf price. The score is 46 out of 100. That score is not a lab test.
Pros
Cons
Best for: A low-spend check where the title says hay and straw and a rough reading is enough.
Less suitable: Anyone who needs a stated hay range, a long named probe, or more than a handful of reviews.
Specifications
Common questions
Can this listing measure barley?
Yes. The bullet lists barley among 14 crops, with wheat, maize, rice, soybean, sorghum, rapeseed and others. The title also says hay and straw.
Does it have a backlight?
Yes. The listing describes a large LCD backlight for dark conditions and for direct sunlight.
Are batteries in the box?
No. The technical details say batteries are not included. The bullet says it uses four AA batteries and switches off after 15 minutes of inactivity.
The YUKERMARB listing at about £31.09 is titled as a grain moisture meter with a voice prompt. The first bullet says it is for forage grass, leymus chinensis, alfalfa and other hays, and then names rice, wheat, maize, barley and other grains. The file has no star rating and no review text, so the amazon.co.uk count on this row is 0. It states a dual-rod probe, a humidity display resolution of 0.1%, an adjust control described as 3% to 5%, voice modes D1 to D4, a backlight when data is present, and auto-off after five minutes. Included components are given as no. The power line says AC/DC and does not describe a plug or a cell type. Batteries are required and are not included. The score is 38 out of 100. That score is not a lab test. It has no badge in this set.
Pros
Cons
Best for: A buyer who has read the forage bullet and accepts that the title is a grain meter, with no reviews in this file.
Less suitable: Anyone who wants a hay-only title, a star rating, or a stated probe length.
Specifications
Common questions
Does the listing say it works on every grain?
No. It names forage grass, leymus, alfalfa and other hays, plus rice, wheat, maize, barley, sorghum, feed, rapeseed, sesame, soybean meal and soybeans.
What accuracy does the saved listing state?
It states a humidity display resolution of 0.1% and continuous sampling. It does not state a plus-or-minus accuracy figure. An adjust control is described as 3% to 5%.
Can the reading be adjusted?
The bullet says short presses of the adjust button change a setting described as 3% to 5%, and that the setting is kept if the batteries are removed.
Three hay moisture meter listings on amazon.co.uk were read from the listing facts and review notes captured on 20 October 2026. No oven test was run. There is no separate methodology file for this comparison. The scores on the rows are the display scores: 71, 46 and 38 out of 100. Hay or straw scale, stated range, probe and sampling, batteries and directions, and price against the job are weighted 30, 25, 20, 15 and 10. A ±0.5% line stays a seller claim. Stars and review counts stay the amazon.co.uk figures. Written reviews on the hay-titled listing are marked United States or Canada.
Hay or straw scale
30%A hay or straw scale is the first check. Grain is tested in a cup or a cell. Baled hay needs a prod. A grain code is a different calibration. The score follows a title or lead bullet that names hay or forage.
Stated range
25%Public hay manuals treat a reading above about 30% as very wet, rather than a precise percent. A ±0.5% line across 0–80% stays a seller claim. A page with no moisture range scores lower on this block.
Probe and sampling
20%Trade probes are commonly about 48 to 50 cm. A parcel length is the box, not the needle. One poke on the dry face can hide a wet core. Density changes the number. A missing probe length is left blank.
Batteries and directions
15%Cheap probes often need four AA cells, sold separately, and switch off after 5 or 15 minutes. A low-battery icon that stays on after a cell change, and directions reviewers call poor, count against the row.
Price against the job
10%A wet-or-dry flag for a few small bales is a different buy from a named hay scale for big bales all season. Shelf prices are the amazon.co.uk figures on 20 October 2026. Farm-trade handhelds sit on another shelf and are not these listings.
Start with a hay or straw scale, then probe length, then the wet end of the scale, then how many readings you will take, then batteries and the manual. The notes below follow that order. None of the scores is an oven test.
A hay moisture meter is a handheld probe you push into a bale to judge whether the hay is dry enough to stack in a UK barn. Buyers are horse owners, small haymakers and contractors who know damp hay can heat and, in the worst cases, catch fire. Search results mix long hay probes, grain meters with crop codes, and wood or wall damp meters. Public manuals treat a usable tool as a hay or straw scale, a probe long enough for that bale, and several readings.
One reading on the dry face can miss a wet core. Farm manuals describe about five readings on a big bale, across the slices, with the tip in the hay rather than in a gap.
Grain is tested in a cup or a cell. Baled hay needs a prod. A 14-crop list, or hay named only in a lead bullet under a grain title, is not a hay scale on its own.
A tight accuracy line on a listing is a seller claim. Manuals treat hay above about 30% as very wet. A low-battery icon that stays on is a reason to distrust the percent.
Buy a hay or straw scale before you buy a grain code. Delmhorst describes grain in a cup or a cell, and baled hay on a prod of about 10 to 18 inches. UK trade meters are commonly about 48 to 50 cm. The Wile 27 datasheet states a 48 cm probe on a capacitive meter, with a density setting and a repeatability of 2 points. A short pin misses the middle of a large round bale. Parcel lengths of about 43 to 49 cm on these listings are the box.
Haymatic’s manual treats a reading over about 30% as qualitative, very wet, and asks for readings across the slices. A ±0.5% bullet across 0–80% is not that method, and it is not the widening error a farm capacitive meter publishes as hay gets wetter. Wile’s notes on density, and about five readings on a big bale, are the sampling check. One poke, a tip in a gap, or a low-battery icon ignored, are the mistakes the digest names.
Three typical situations, each with a recommendation from this comparison.
You have a few small squares and you want the listing whose title is a hay tester. The Kalageen TK100H is about £76.50, with a stated 0–80% and 4.3 from 63 ratings. Those written reviews are marked United States or Canada. Take several readings. It is not a baler sensor, and ±0.5%n is a listing claim.
You want hay and straw in the title and a lower shelf price. The Yosoo Health Gear probe is about £24.18, with a backlight, voice in Chinese and English, and auto-off after 15 minutes. The star line is 3.6 from 4 ratings. Four AA batteries are not included. The page does not state a moisture range.
You have read the forage bullet and you accept a grain moisture meter title. The YUKERMARB listing is about £31.09, with a 0.1% resolution line, voice modes D1 to D4, and auto-off after five minutes. There is no star line in the file. Power is printed as AC/DC with no plug or cell type.
The top pick is the Kalageen TK100H at about £76.50. It is the listing in this set whose title is a hay moisture tester, for forage, leymus, alfalfa and other hays, with a stated range of 0–80% and ±0.5%n. amazon.co.uk shows 4.3 from 63 ratings. Those written reviews are marked United States or Canada. A low-battery icon that stayed on, and dense bales that read high against a baler and a laboratory, are in the same file. Best value is the Yosoo Health Gear hay probe at about £24.18. Hay and straw are in the title, the crop list is also grains and seeds, and the star line is 3.6 from 4 ratings. One short review is marked United Kingdom. The YUKERMARB listing at about £31.09 has no star line. Its title is a grain meter and the lead bullet names hay. None of these scores is a lab test, and none of these listings is a baler sensor.
Kalageen TK100H
Highest score in the set: a hay-tester title, a stated 0–80%, and 4.3 from 63 ratings. The written reviews are marked United States or Canada. Not a lab test.
Yosoo Health Gear hay probe
Best value at about £24.18: hay and straw in the title, backlight and voice, and 3.6 from 4 ratings. No stated moisture range.
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 from the research digest, last checked on 20 October 2026. Shelf prices and star lines are the amazon.co.uk figures captured with these three listings. The price bands are this set, not a market average.
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 are from the UK listings checked on 20 October 2026. We did not lab-test these hay moisture meters.
