Dr.Meter Wood Moisture Meter Review: Best Budget Pin Meter for Firewood?

This Dr Meter moisture meter review looks at whether the popular MD812, a cheap pin-type meter sold for general damp detection, is actually good enough for the one job that matters to a wood burner: telling you when your logs have dried below the 20% mark that makes them ready to burn. It is not a firewood-specific tool, which raises a fair question, but the honest answer is that for checking split logs it does the important part well, provided you use it correctly.

Here is what it does, where it falls short, and who should buy it.

What the Dr.Meter MD812 is

The MD812 is a compact, handheld pin-type moisture meter with a large LCD display, powered by a single 9V battery. Its headline specs for our purposes:

• Measuring range of 5% to 40%, which comfortably covers the whole journey of firewood from fresh-felled down to seasoned.
• Stated accuracy of around ±1%, which is in line with far pricier meters for this kind of reading.
• Two stainless steel pins, plus spare pins, that you push into the wood to take a reading, with a hold function to freeze the number and an audible alert.

It is marketed for wood, drywall, plaster, carpet and sub-flooring, so it is a general damp meter rather than a dedicated firewood tester. For reading a log, though, the mechanism is identical to what a “firewood” meter uses: two pins measuring the electrical resistance across a short gap.

Does it read firewood accurately?

For the reading that counts, yes. The critical number for firewood is 20% moisture content or below, the point at which wood is “ready to burn” and produces heat cleanly rather than smoke and creosote. The MD812’s range and accuracy are more than adequate to tell a 25% log from an 18% one, which is the decision you actually need to make.

The catch is universal to all pin meters, not a fault of this one: you must test the freshly split inner face of a log, not the outside. The surface of a log dries first, so probing the outer face gives a falsely low reading. Split a log (see how to split logs by hand), press the pins into the fresh middle, and read that. That technique matters far more to your results than which budget meter you own.

Where it falls short

Be realistic about a meter at this price:

• It is not calibrated specifically for wood species. Like most cheap meters, it uses a general scale, so treat the reading as a reliable guide rather than a laboratory figure. For deciding “ready or not ready”, that is fine.
• The build is basic. The plastic body and pins are functional, not rugged. Kept in a drawer and used gently, it lasts; thrown in the bottom of a log bag, less so.
• No species or temperature correction that you get on professional meters costing many times more. For firewood, you do not need it.

How it compares

Against a dedicated budget firewood meter, the MD812 performs the same core job. Against premium options, the difference is durability, features and calibration you will not use for logs. If you want the alternatives, see our best cheap moisture meters under £20, the Valiant FIR421 review and the Stihl moisture meter review for the step up. For the wider field, our best firewood moisture meters roundup ranks them.

One note on buying: Dr.Meter is a brand more established in the US market, so UK availability can vary between retailers. Check it is stocked and priced sensibly before ordering, and compare it against a UK-focused firewood meter at a similar price. Check current price on Amazon UK and weigh it against the alternatives above.

Verdict

For a wood burner who just wants to know whether their logs are ready, the Dr.Meter MD812 is a capable budget choice. Its range and accuracy easily handle the 20% decision, and used properly (splitting the log and testing the fresh inner face) it will keep you from burning wet wood. It is not rugged and it is not firewood-specific, so if you want a tool built for the log store you may prefer a dedicated UK firewood meter. But as a cheap, accurate way to check moisture, it does the job. Check current price on Amazon UK before you buy.

Frequently asked questions

Is the Dr.Meter MD812 good for firewood? Yes, for the key task. Its 5% to 40% range and roughly ±1% accuracy easily distinguish ready-to-burn wood (20% or below) from wood that still needs seasoning. It is a general damp meter, but the pin mechanism reads split logs the same way a firewood meter does.

What moisture reading means firewood is ready to burn? 20% moisture content or below. At that level wood burns cleanly and gives good heat. Above about 20%, logs are harder to light, produce more smoke, and deposit creosote in your flue.

How do I get an accurate reading with this meter? Split a log and press the pins into the freshly exposed inner face, not the outer surface. The outside dries first and reads falsely low. Testing the fresh middle is the single most important step, whatever meter you use.

Is the Dr.Meter accurate enough compared to expensive meters? For firewood, yes. Premium meters add species calibration, temperature correction and tougher build, none of which change the ready-or-not decision for logs. The MD812’s accuracy is sufficient for that call.

Is the Dr.Meter available in the UK? It can be, but the brand is more common in the US, so stock and pricing vary by retailer. Check availability and compare it with a UK-focused firewood meter at a similar price before buying.

For the full picture on drying, our firewood seasoning time calculator and the government’s Ready to Burn scheme explain why the 20% rule matters.