Wood Moisture Meter

Quick Answer: The Wood Moisture Meter is a handheld instrument that estimates the moisture content of timber, expressed as a percentage of the wood’s dry mass, from an electrical property of the wood between its sensing contacts. A wood moisture meter is used to check timber before joinery, finishing and building work.

How Timber Moisture Is Read

Moisture content of wood is defined as the mass of water divided by the mass of the completely dry wood, so it can exceed 100 percent in freshly felled logs. Pin-type meters drive two steel pins into the timber and measure the electrical resistance between them, which falls sharply as moisture rises. Pinless meters instead sense a change in capacitance through a pad pressed on the surface. Which method this model uses, and its range, should be checked before ordering.

Readings depend on the wood as well as the water in it. Species differ in density and chemistry, so meters apply species or group corrections, and resistance readings also shift with temperature. For teaching, the meter can be compared with the oven-dry method: weigh a small sample, dry it at about 103 °C until its mass stops changing, weigh again and calculate the moisture content from the loss.

Timber for indoor joinery and furniture is dried until its moisture content is close to the level it will settle at in the room where it is used; fitting wetter wood leads to shrinkage, gaps and cracked finishes after installation. Take readings at several points and, with pin meters, at more than one depth, because the surface dries faster than the core. In building surveys a visual infrared thermometer is a useful partner for finding cold, possibly damp areas first.

Specifications

Applications

• Checking timber before joinery, cabinet work and furniture projects in carpentry workshops
• Confirming floorboards and skirting are dry enough before finishing
• Tracking the drying of planks over several weeks in an agriculture or forestry class
• Checking firewood and biomass samples in energy and environment projects

Care & Handling

• Insert pins in the direction the manual recommends, and never hammer them in unless the meter is made for it.
• Wipe the pins clean after use and replace the protective cap.
• Replace the battery when the low-battery sign appears, since low voltage can skew readings.
• Do not use it on live electrical fittings or on surfaces with standing water.

Why Choose LabEquip

Carpentry and joinery workshops in ITIs and polytechnics, building-technology courses and school design-and-technology rooms buy moisture meters to teach timber selection. LabEquip lists this meter in the General Lab Products range; share the timber types you work with on the contact page.

Frequently Asked Questions

What moisture content should furniture timber have?

It should be close to the moisture level the wood will reach in the room where it is used, which depends on local climate and heating. Timber much wetter than that will shrink after making, opening gaps and cracking finishes.

Why does the species setting matter?

Different woods conduct electricity differently at the same moisture content because their density and chemistry differ. Without the right species or group setting, a meter can read several percent high or low.

Why are readings at the surface lower than inside?

Wood dries from the outside inward, so the surface is often drier than the core. Pin meters can be pushed to different depths to compare them; a large difference means the timber is still drying.

How can I check the meter’s accuracy?

Cut a small sample next to where you measured, weigh it, dry it in an oven at about 103 °C until its mass is constant and weigh it again. Moisture content is the mass lost divided by the dry mass, times 100.

Can it measure moisture in walls or plaster?

Wood meters are scaled for timber. Some models include a building-material mode that gives relative readings on plaster or brick, but those are comparisons, not true moisture percentages.

Does temperature affect the reading?

Yes, for resistance-type meters. Warm wood conducts better and reads wetter than cold wood at the same moisture content, so meters or correction tables adjust readings to a reference temperature.

Last Updated: September 2026