Moisture Meter Buying Guide: How to Choose One for Firewood (UK)

Knowing how to choose a moisture meter for firewood saves you from two things: burning wet wood that tars up your flue and wastes heat, and overpaying for features a log pile will never use. A moisture meter is a cheap tool that answers one important question, is this log dry enough to burn, and the good news is you do not need an expensive one to get a reliable answer. This guide explains what actually matters when buying, so you can pick the right meter first time.

Why a moisture meter is worth it

Since 2021, firewood sold in small volumes in England must be certified “Ready to Burn”, meaning under 20% moisture, because wet wood produces far more smoke and pollution and much less heat. Even if you season your own, guessing by weight or the sound of two logs knocked together is unreliable. A meter turns “probably dry” into a number you can trust. The official Ready to Burn scheme from Woodsure explains the standard your fuel should meet.

Pin versus pinless: the first decision

This is the choice that matters most, and for firewood the answer is usually simple.

• Pin (pronged) meters push two small metal pins into the wood and measure the electrical resistance between them. They are cheap, accurate for firewood, and, crucially, you can test the freshly split inner face of a log, which is the only reading that tells you the truth. This is the type to buy for firewood.
• Pinless (scanner) meters read moisture through a flat sensor pressed against the surface. They are better for finished timber and flooring where you do not want pin holes, but they read the surface rather than the core, which is exactly the wrong thing for a log.

For firewood, a pin meter wins almost every time. Our full pin vs pinless comparison goes deeper if you want the detail.

The specifications that actually matter

Ignore the long feature lists on the box and focus on these:

• Moisture range. A range that covers roughly 5% to 40% is plenty for firewood. You are only ever checking whether a log is above or below 20%, so a huge range adds nothing.
• Accuracy. Look for a stated accuracy of around plus or minus 2% or better. Cheap meters are usually accurate enough for the go, no-go decision that firewood really needs.
• Species or scale settings. Some meters let you select a wood type or use a reference scale. It is a nice extra but not essential; consistency matters more than a perfect absolute figure.
• A clear display and hold function. A backlit screen and a reading that holds while you pull the meter out of an awkward log pile is genuinely useful in a dim shed.
• Battery type. A common battery you can actually replace beats a sealed unit.

How much to spend

This is a tool where cheap works. A budget pin meter of a few pounds will reliably tell you whether a log is under 20%, which is all most people need. Branded meters add sturdier build, better displays and sometimes calibration you can trust more, but they do not make the core reading dramatically more accurate for firewood. Our guide to cheap versus branded moisture meters weighs this up, and if you want tested picks, see our roundup of the best firewood moisture meters.

If you would rather compare specific models, we have hands-on reviews of the Brennenstuhl, Proster and Dr. Meter meters, plus a head-to-head on the Stihl and Valiant options.

Using it right matters as much as buying right

Even the best meter gives a useless reading if you use it wrong. The one rule that catches everyone: never test the outside of a log. Split a log and press the pins into the freshly exposed inner face, across the grain, at room temperature. A log can read a deceptively dry 15% on its weathered surface while the core is still soaking at 30%. Buy the meter for the split test, not the surface scan, and it will pay for itself in a single season of better burns.

Frequently asked questions

What type of moisture meter is best for firewood? A pin (pronged) meter. It lets you push the pins into the freshly split inner face of a log, which is the only reading that reflects the true core moisture. Pinless meters read the surface, which is the wrong measurement for firewood.

How accurate does a firewood moisture meter need to be? Not very. You are checking whether a log is above or below 20%, so an accuracy of around plus or minus 2% is ample. Even inexpensive pin meters handle this go or no-go decision reliably.

How much should I spend on a moisture meter for firewood? A budget pin meter costing a few pounds is enough for most people and will accurately flag whether wood is under 20%. Branded meters offer better build and displays, but the core reading is not dramatically more accurate for firewood.

What moisture reading is safe to burn? Under 20%, which is the “Ready to Burn” standard for firewood in the UK. Wood above that produces more smoke and tar and gives out less heat, so season or dry it further before burning.

Do I need to split the log to test it? Yes. Always split a log and test the freshly exposed inner face across the grain. The weathered outer surface can read far drier than the wet core, which is the single most common reason people think their wood is ready when it is not.