Get the Lignomat mini-Ligno E/D for oak, maple, ash or pine: it corrects for the wood and for cold. The DX/C adds 46 species settings but comes as a kiln-probe kit. For tenths and a hold button, get the Klein ET150 and test indoors.
Most firewood: Lignomat mini-Ligno E/D$111.48 at AmazonPrice as of Oct 22, 2026, 3:25 AM EDT
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply to the purchase of this product.
How the three meters score
Our spec score runs every meter through the same nine checks from the makers’ manuals and spec sheets: calibration check, published accuracy, species settings, temperature correction, range, decimal readings, pin depth, spare pins and warranty. The method is at the bottom of the page.
Plain Prepper spec score out of 10, from each maker’s manual and product page, read Oct 22, 2026. It is not a customer rating or a bench test.
Lignomat DX/C: the highest score
Best for mixed-species woodpiles
Lignomat mini-Ligno DX/C
Product photo: Amazon
mini-Ligno DX/C, package D-33 with probes and cables
46 settings, with most firewood species on the card
Checks its own calibration before every reading
Published correction chart for cold wood
Two pin lengths: 3/16 in and 7/16 in
Cons
On Amazon it only comes as a kiln-probe kit
Whole-number steps above 10%
No published ± accuracy and no hold button
5 to 65% range46 settings0.1% below 10%, 1% abovePins 5 and 10 mmAuto calibration check70°F correction chart9 V battery2-year warranty
Buy it if
You burn several kinds of wood, from oak and hickory to pine and fir, and want every reading corrected for the species you’re testing.
Skip it if
You only need a yes or no on oak, maple or pine. The E/D has the same corrections in two groups and the same cold-wood chart.
The Lignomat mini-Ligno DX/C is the most complete firewood meter we checked, and it scores 8.0. Lignomat gives it 46 settings, and its species card lists most of what goes in a woodstove: red oak on setting 9, white oak 10, hickory 6, hard maple 8, ash 8, birch 3 and Douglas fir 14.
Species settings are the reason it beats the one-scale meters. Woods don’t all read alike on a pin meter, so Lignomat builds the corrections in. The manual says the reading on the display is already corrected for the setting you choose. A one-scale meter gives you the same number for oak and pine and leaves the guessing to you.
Cold wood is the other reason. All mini-Lignos are calibrated for wood at 70°F, and the manual prints a correction table for colder and warmer wood. On that chart, a reading of 17 on wood at 32°F means about 21%, which is over EPA’s 20% line. Our cold-wood corrector uses the same chart.
Lignomat says the meter checks its own calibration before every measurement and adjusts if it needs to, so there’s nothing to recalibrate. It reads while the switch between the pins is pressed, so there’s no hold button. The LED display shows tenths below 10% and whole numbers above, so near 20% you get 19 or 20, not 19.4.
The catch is the box. Amazon sells the DX/C as Lignomat’s package D-33: the meter plus three PK probes and cables built to monitor lumber in a dry kiln. Lignomat’s page says D-33 cables are 12 ft; the Amazon title says 6 ft. You won’t need the probes for firewood, and they’re why it costs more than the E/D.
The rest matches the E/D. Two pairs of pins, 3/16 inch (5 mm) and 7/16 inch (10 mm), with the long pair stored in the case. A 9-volt battery. Lignomat’s 2-year warranty, plus a lifetime warranty on the display. Its range is 5 to 65%, though Lignomat says readings are less accurate above the fiber saturation point at about 25%.
Two wood-group settings cover oak, maple, ash, hickory and pine
Same calibration self-check and cold-wood chart as the DX/C
Long pins reach 7/16 in
Just the meter, no kiln kit
Cons
Whole-number steps above 10%
No published ± accuracy and no hold button
Range stops at 45%
6 to 45% rangeWood groups 2 and 30.1% below 10%, 1% abovePins 5 and 10 mmAuto calibration check70°F correction chart9 V battery2-year warranty
Buy it if
You burn oak, maple, ash, hickory or pine and want a reading corrected for the wood and for a cold shed, without paying for kiln probes.
Skip it if
You want tenths around 20% and a reading that holds on screen. The Klein ET150 shows 0.1% steps and has a hold button.
The mini-Ligno E/D is the DX/C’s simpler sibling, and it scores 7.2. It has the same LED display, the same calibration self-check, the same two pin lengths and the same 70°F correction chart. What it doesn’t have is the long species card: it corrects in two wood groups instead of 46 settings.
For a woodpile, two groups go a long way. Lignomat’s card puts red and white oak, beech, locust, cedar and poplar in group 2. Group 3 holds ash, aspen, birch, cherry, cottonwood, elm, hickory, maple, walnut, Douglas fir, pine and spruce. You switch groups with a double click on the switch between the pins.
Its range is 6 to 45%. That covers EPA’s own not-ready example of 37% with room to spare. Past the fiber saturation point at about 25%, Lignomat says readings get less accurate, which matters less than it sounds: the decision you’re making is whether a split is under 20%.
Lignomat’s manual is specific about depth. For a core reading it says to push the pins through at least a third of the wood, or to make a fresh cut and read the end grain near the surface and at the core. On a split, that’s EPA’s advice too: test the newly split face. The long pins go 7/16 inch deep.
Against the DX/C it gives up the species card, the top of the range and the connector for probes and electrodes. Against the Klein it gives up tenths above 10%, a hold button and colour cues, and Lignomat publishes no ± figure for it. That’s why it scores 7.2, below the DX/C and just above the Klein.
It runs on a 9-volt battery and turns itself off. Lignomat covers its meters for 2 years and the display for life. When we checked, the Amazon seller was Prime Tools, and the listing was new and in stock.
Klein publishes no temperature correction, and it’s rated for 50°F and up
Hardwood mode tops out at 33%
Hardwood 0 to 33%Softwood 0 to 55%0.1% resolutionPins 9.5 mm, 8 mm inCap calibration checkHold and work light2 AAA batteries6.5 ft drop rating
Buy it if
You want a pocket meter that holds the number, shows tenths near the 20% line and survives a drop off the splitting block.
Skip it if
Your wood lives in a cold shed and you won’t bring a piece inside to warm up first. The E/D has a correction chart for that.
The Klein ET150 is the simplest meter here and the only pick with a published accuracy figure: ±2% on wood. It scores 7.0, right at our floor. Klein gives it four modes: hardwood (0 to 33%), softwood (0 to 55%), drywall and building materials. You step through them with the MODE button.
The display shows tenths across the whole range, and the hold button freezes the reading so you can pull the pins and look. That’s useful at the woodpile, where you’re deciding between 19.6 and 20.4. The backlit screen also turns green, orange or red, and a beep sounds on red.
Read the number, not the colour. In softwood mode, green runs to 19.9% and orange starts at 20%, which lines up with EPA’s 20% line. In hardwood mode green stops at 13.9%, so a dry oak split at 17% shows orange even though EPA calls it ready. Our colour table lays it out.
Checking calibration is quick. Pull the cap, choose softwood mode and push the pins into the two holes in the cap. Klein says the screen should show 21.8%, give or take 0.5%. If it doesn’t, Klein’s manual says to stop using the meter.
Cold is its weak spot for firewood. Klein rates it to operate from 50 to 104°F and publishes no temperature correction. In winter, bring a split inside, let it warm to room temperature, then split it again and test the fresh face. Hardwood mode stops at 33%, so very green oak may read off the top of the scale.
The pins are 9.5 mm long and Klein says they go up to 8 mm in; two spare pins come in the box. It runs on two AAA batteries, turns off after 5 minutes unless you disable that, and is rated for a 6.5-foot drop. Klein’s manual points to its warranty page, where Klein’s electrical test and measurement tools get two years.
Side-by-side
Every spec comes from the maker’s manual or product page. Scroll sideways on a phone.
All three are handheld pin meters: two metal pins go into the wood and the meter shows its moisture content as a percentage.
What reading means the wood is ready
EPA’s Burn Wise flyer puts it in one line: wood is dry, seasoned and ready to burn below 20% moisture content. It adds that wood burns most efficiently between 15 and 20%.
Moisture content from EPA’s flyer “Test Your Wood with a Moisture Meter” (EPA-456/F-20-003). The two examples are meter photos in the flyer.
EPA lists what dry wood buys you: fires that are easier to start and burn hotter, less wood for the same heat, and less creosote, which means fewer chimney fires. Wet wood does the opposite, with more smoke and more creosote.
Not everyone draws the line at the same place. Woodhaven, which sells its own firewood meter, says 10 to 15% is ideal. EPA’s figure is under 20%, with 15 to 20% burning most efficiently. Both agree on the number that matters: if a fresh-split face reads under 20%, it’s ready to burn.
EPA’s advice for getting there is to split, stack, cover and store wood for at least 6 to 12 months. Split wood dries much faster than whole logs, and smaller pieces burn cleaner. A meter tells you when that wait is over.
How to test firewood with a meter
EPA’s steps are short: split the wood, test the newly split side, and push the probes into the wood grain. The meter makers add a calibration check, a setting and a depth.
1
Check the meter
Lignomat meters check themselves; on the Klein, push the pins into the cap and look for 21.8%.
2
Pick the setting
Choose the species or wood group on a Lignomat, or hardwood or softwood on the Klein.
3
Split a piece
Take a split from the stack and split it again, so you read the inside, not the weathered face.
4
Push the pins in
Into the fresh face, as deep as they go. EPA says to insert them into the wood grain.
5
Correct for cold
Below 68°F, read the Lignomat chart or warm the piece indoors first.
6
Test a few pieces
A reading is for that one split. Check pieces from the top, middle and bottom of the stack.
Why split it again? The outside of a split has been in the wind for months. Lignomat’s manual makes the same point for lumber: for core readings in wood over 5/4 inch thick, make a fresh cut and measure the end grain near the surface and at the core, then compare them to spot uneven drying.
Depth matters too. General Tools tells MMD4E owners to push the pins in at least a quarter of the material’s thickness for an average reading, and Lignomat says a third for a core reading. No handheld pin reaches a third of the way into a 4-inch split. That’s why the fresh face is the honest test.
Pin depth from each maker’s manual or spec sheet, read Oct 22, 2026. A third of a 4-inch split is about 34 mm.
Correct a reading taken on cold wood
Lignomat calibrates its meters for wood at 70°F and prints a correction chart in the manual. On that chart, cold wood reads drier than it is, so a split from an icy shed can pass when it shouldn’t.
Cold-wood corrector
A reading of 17 on wood at 32°F means about 21%.
20% or more once corrected: not ready yet, even though the display read under 20.
From Lignomat’s wood temperature correction chart in the mini-Ligno E/D and DX/C manuals, read Oct 22, 2026. Made for Lignomat meters; Klein and General Tools publish no chart.
The chart near the 20% line
Display reads
Wood at 32°F
41°F
50°F
59°F
68°F
14%
17.5%
17%
16%
15%
14%
15%
18.5%
18%
17%
16%
15%
16%
20%
19%
18%
17%
16%
17%
21%
20%
19%
18%
17%
18%
22%
21%
20%
19%
18%
19%
23%
22%
21%
20%
19%
20%
24%
23%
22%
21%
20%
22%
26%
25%
24%
23%
22%
24%
28%
27%
26%
25%
24%
Read across a row. A Lignomat showing 17 on wood at freezing means the split is really about 21%, over EPA’s line. The same 17 on wood at 59°F means 18%, and at room temperature it means 17. The colder the wood, the bigger the gap, which is when most people are checking wood for the stove.
Lignomat’s manual gives its own example: a reading of 11 on wood at 41°F is really about 14%. The chart is Lignomat’s, made for its own meters. Klein rates the ET150 to operate from 50°F up, and the MMD4E manual gives an operating range of 32 to 122°F; neither publishes a correction.
Meter
Calibrated for
Cold correction
Rated to operate
Lignomat DX/C and E/D
Wood at 70°F
Chart in the manual, 32 to 140°F
Not stated
Klein ET150
Not stated
None published
50 to 104°F
General Tools MMD4E (left out)
Not stated
None published
32 to 122°F
Extech MO50A (left out)
Accuracy given at 72 to 77°F
None published
41 to 113°F
With any meter that publishes no chart, the safe move is the same. Bring a split inside, let it reach room temperature, split it again and test the fresh face. That takes the cold out of the reading without any arithmetic.
Which setting to use for your firewood
Each pick corrects for the wood a different way. Here’s the setting for common firewood on each, from Lignomat’s species cards and Klein’s manual.
Firewood
DX/C setting
E/D group
Klein mode
Red oak
9
2
Hardwood
White oak
10
2
Hardwood
Hickory
6
3
Hardwood
Hard maple
8
3
Hardwood
Ash
8
3
Hardwood
Beech
11
2
Hardwood
Birch
3
3
Hardwood
Cherry
6
3
Hardwood
Elm
8
3
Hardwood
Locust
Not on the card
2
Hardwood
Cottonwood
13
3
Hardwood
Douglas fir
14
3
Softwood
Southern yellow pine
20
3
Softwood
Eastern white pine
11
3
Softwood
Spruce
18
3
Softwood
Red cedar
8
2
Softwood
The DX/C numbers come from Lignomat’s yellow species card for software version 2.14. Lignomat’s card says a DX/C that reads 4.8% on setting 3 has version 2.12, which uses a blue card with different numbers, so go by the card that came with your meter.
Locust isn’t on the DX/C card. Lignomat’s E/D card puts it in group 2, and the company asks you to contact it for woods it doesn’t list.
A mixed pile is where the DX/C earns its score. Oak, hickory and pine sit on three different settings, and on the E/D they span both groups. On the Klein they’re all hardwood except the pine. A one-scale meter treats them all the same, which is the main reason the MMD4E and Extech scored under 7.0.
What a meter’s colours mean for firewood
Coloured screens and beeps don’t follow EPA’s 20% firewood line. Here’s where a dry split at 18% lands on each.
Meter and mode
Low or green
Middle
High
A split at 18% shows
Klein ET150, softwood
0 to 19.9%
20 to 39.9%
40% and up
Green, ready
Klein ET150, hardwood
0 to 13.9%
14 to 24.9%
25% and up
Orange, though EPA says ready
General Tools MMD4E, wood (left out)
5 to 11.9%
12 to 15.9%
16 to 50%
High, though EPA says ready
Lignomat DX/C and E/D
Numbers only
Numbers only
Numbers only
18
Colour bands from the Klein ET150 and General Tools MMD4E manuals, read Oct 22, 2026; EPA line from the Burn Wise flyer.
Neither Klein nor General Tools says its colours are set for firewood, and both meters also read drywall and building materials. For firewood, ignore the colour and compare the number with 20.
How accurate a firewood meter is
Close enough to make the call, if you test the right spot. Klein and General Tools publish ±2% on wood, Extech ±3% plus 5 digits, and Lignomat no ± figure at all.
Meter
Published accuracy
Display steps near 20%
Highest wood reading
Lignomat DX/C
Not published; self-checks before each reading
1%
65%, by species
Lignomat E/D
Not published; self-checks before each reading
1%
45%
Klein ET150
±2% on wood
0.1%
33% hardwood, 55% softwood
General Tools MMD4E (left out)
±2%
0.1%
50%
Extech MO50A (left out)
±(3% + 5 digits) at 72 to 77°F
0.1%
50%
A ±2% meter showing 19 could be anywhere from 17 to 21. That’s why a reading of 19 on one piece isn’t a green light for the whole stack. Test several splits, and treat anything in the high teens as nearly ready rather than done.
Range matters less than people think. Lignomat says pin readings are less accurate above the fiber saturation point, at about 25%. Above that, treat the number as “still wet” rather than an exact figure. The question you’re answering sits near 20, below that point.
Meters we checked and left out
These are meters people search for. Each one missed our 7.0 floor or a basic check, so we don’t recommend them here.
Meter
Score
What held it back
What it does well
General Tools MMD4E
5.8
One wood scale with no species or temperature correction; 1-year warranty; its colour bands call 16% “high”
±2% accuracy, tenths, a hold button, a cap calibration check and spare pins
Extech MO50A
4.3
No calibration check or spare pins stated; ±(3% + 5 digits); one wood scale
Threaded replaceable 8 mm pins, tenths, 2-year warranty
Calculated Industries 7440
Left out before scoring
The maker’s current site no longer lists the meter, only its pins pack
Two pin lengths, per the old product page
General Tools MMP100
Left out before scoring
No maker page we could find to check the listing against
Low price on Amazon
AW Perkins, TopTes, Mecurate and similar
Left out before scoring
Little-known brands with claims from the listing only
Cheap, and often sold as firewood meters
EPA says a basic meter from a hardware store costs $15 to $40. The ones we checked read on one wood scale with no published temperature correction, so they’re least reliable close to 20%, on the wood and in the weather where the call is hardest: oak on a cold morning.
How to choose a meter
1
Know your wood
One species, or a mixed pile of oak, maple and pine?
2
Know where you test
In a cold shed, or a piece brought indoors?
3
Look for corrections
Species settings and a published temperature chart.
If you heat with wood all winter, the E/D is the one we’d buy. It’s the cheaper of the two Lignomats, it corrects for the wood and the cold, and the long pins reach deeper than the others. If you burn a few fires a year and can warm a split by the stove before you test it, the Klein will do the job for much less.
Questions people ask
Do firewood moisture meters work?
Yes, if you test a freshly split face and correct for cold wood. EPA recommends one to take the guesswork out of knowing whether wood is ready. EPA says to test the newly split side, and Lignomat’s chart shows cold wood reads drier than it really is.
How do you test firewood with a moisture meter?
EPA’s steps: split the wood, test the newly split side, and push the probes into the wood grain. Choose the right species or wood setting first, and if the wood is cold, warm it indoors or use your meter’s temperature chart.
What is a good moisture level for firewood?
Below 20%, according to EPA, and it says wood burns most efficiently between 15 and 20%. Woodhaven, which sells a firewood meter, says 10 to 15% is ideal. Either way, under 20% on a fresh-split face means ready to burn.
How accurate is a moisture meter on firewood?
Klein and General Tools publish ±2% on wood, and Extech ±3% plus 5 digits. Lignomat publishes no ± figure but says its meters check calibration before every reading. Lignomat also says readings above about 25% are less accurate, so meters are best at the 15 to 25% range that matters for burning.
Do moisture meters work on all wood?
They read all wood, but not all wood reads alike. That’s why Lignomat’s DX/C has 46 species settings and the E/D two wood groups, and the Klein has hardwood and softwood modes. A meter with one scale gives the same number for oak and pine.
Why does cold firewood read drier?
Lignomat calibrates its meters for wood at 70°F, and its chart shows a reading of 17 on wood at 32°F is really about 21%. Bring a split inside to warm up, or use the chart if your meter has one.
How long does firewood take to season?
EPA says to split, stack, cover and store it for at least 6 to 12 months, and that split wood dries much faster than whole logs. A meter tells you when your wood has made it.
Are cheap moisture meters good enough for firewood?
EPA says a basic meter costs $15 to $40 at a hardware store, and it recommends using one. The ones we checked have no species or temperature correction, so they’re least reliable right near 20% on cold hardwood.
How we pick, and how the score works
Why trust us
Plain Prepper is owned and edited by Isaac Daniels. Every spec on this page comes from the maker’s own manual, spec sheet or product page, and the advice on testing and seasoning from EPA’s Burn Wise program, named in the sources below. We don’t bench-test meters, so we never present a number as measured by us.
Prices and photos come from Amazon and show the time they were read.
How we pick
Handheld pin-type wood moisture meters from well-known makers.
Specs read from the maker, not from other review sites.
Each Amazon listing checked as genuine, new and in stock the day we published.
Every product checked against CPSC recalls; we found no moisture meter recalls.
Every pick scores 7.0 or better.
How the spec score is calculated
We read nine facts from each maker and put every meter through the same table below. Weighting those lines gives the score out of 10. Customers’ stars and bench tests play no part.
Where a maker doesn’t state a feature, it scores 0 on that line. Klein’s warranty comes from its warranty table, which gives electrical test and measurement tools two years; the ET150 sits in Klein’s test and measurement catalog, and its manual points to that table.
Check
Weight
How it’s scored
Calibration check
10%
10 if the meter checks itself or comes with a cap or block to check it; else 0
Published accuracy
15%
10 for ±2% on wood; 6.7 for ±3%; 0 if none is published
Species settings
20%
10 for 20 or more species settings; 6 for two wood groups or hardwood and softwood modes; 0 for one scale
Temperature correction
15%
10 if the maker publishes a wood temperature correction; else 0
Range to 40%
10%
10 if every wood setting reads to 40% or more; 5 if one of two does
Decimal readings
5%
10 if the display shows 0.1% steps through 15 to 25%; else 0
Pin depth
10%
Pin depth in mm, up to 10
Spare pins
5%
10 if a spare or second pair of pins comes in the box; else 0
Warranty
10%
Warranty years ÷ 2 × 10, up to 10
Sources
Lignomat USA, mini-Ligno DX/C and mini-Ligno E/D product pages, Package D-11/D-33/D-55 page, user manuals and wood group cards (DX/C card version 2.14), lignomat.com, read Oct 22, 2026: settings, range, display, pins, calibration check, temperature correction chart, fiber saturation note, core readings, warranty.
Klein Tools, ET150 Pin Moisture Meter product page and instruction manual, kleintools.com, read Oct 22, 2026: modes, ranges, accuracy, resolution, pins, colour bands, calibration check, operating temperature, batteries, drop rating.
Klein Tools, Limited Warranty by product group, kleintools.com, read Oct 22, 2026: category 02, electrical test and measurement tools, two years.
General Tools, MMD4E product page and user manual, generaltools.com, read Oct 22, 2026: range, accuracy, pins, colour bands, calibration check, depth tip, operating temperature, warranty.
U.S. EPA Burn Wise, “Test Your Wood with a Moisture Meter” (EPA-456/F-20-003), epa.gov, read Oct 22, 2026: 20% line, 15 to 20% most efficient, seasoning time, test steps, meter cost. EPA notes the Burn Wise program pages are a historic record as of Oct 30, 2025.
Woodhaven, firewood moisture meter product page, read Oct 22, 2026: 10 to 15% ideal.
U.S. Consumer Product Safety Commission recall database (saferproducts.gov API), searched Oct 22, 2026 for moisture meter, wood moisture, Lignomat and Klein Tools.
Amazon product data through Amazon’s Creators API (prices, sellers, stock, photos), refreshed daily; each price shows the time it was read.
