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General Tools MMH800 moisture meter with dual sensor cap open

General Tools & Instruments

General Tools MMH800 Pin/Pinless Moisture Meter measurement tool

SKU CH-0FRW-1MXPX

Measures moisture in wood and building materials using pin or pinless sensors plus temperature and humidity

  • Pin and pinless sensors detect moisture in walls and wood
  • Humidity and temperature readings show mould risk at a glance
  • Audible and visual alerts flag high, medium, low levels
  • Flip-open cap reveals pins for precise spot checks
  • Model 800 combines leak detection and environmental monitoring

Dual-Mode Moisture Detection

The General Tools MMH800 combines pin-type and pinless sensors in one handheld meter. It measures moisture percentage, ambient temperature and relative humidity on building materials. Audible and visual alerts indicate high, medium and low levels. A °F/°C switch lets you choose the temperature scale. The tool is aimed at homeowners, inspectors and DIYers who need to find hidden dampness before mould develops.

Pinless Scanning Limits

Pinless mode uses a flat pad to scan larger areas quickly without leaving marks. It detects moisture near the surface but cannot reach deep pockets or distinguish between material layers. Pin mode opens a protective cap to expose sharp electrodes for exact content readings at a specific point. Both modes require firm contact with the test surface and calibration for the material being measured.

Upgrade From Single-Function Meters

This meter replaces separate pin-only or pinless-only devices and adds temperature and humidity readings in one unit. The jump is worth it when you need both rapid area surveys and precise spot checks during the same inspection. It is not suited for users who only need occasional surface checks or who require data logging and wireless reporting features.

How it compares

Measured against everything we stock in Meters, Testers & Measuring Tools, at today’s prices. Recalculated every night.

Price $160.99
Pricier than about 72% of the 3,030 comparable items (median $54.99).

Specifications

No published specifications for this item yet.

Questions about this item

Which version of the MMH800 should I choose for both pin and pinless moisture detection?

The MMH800 combines both pin-type and pinless flat-pad sensors in one tool, so a single model covers both measurement methods.

What do the moisture percentage, temperature and humidity readings tell me when I use the meter on a wall?

The dual display shows moisture percentage, ambient temperature in °F or °C, and relative humidity, with audible and visual alerts for high, medium and low moisture levels.

How does the pinless sensor cap the measurement depth compared with the pin sensors?

The pinless pad scans larger surface areas non-invasively, while opening the cap exposes the pin sensors for exact content readings at the contact points.

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