TABLE OF CONTENTS
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Key Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 – 3
What’s in the Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Product Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Setup Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 – 5
Install Battery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Advanced Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 – 5
Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 – 10
Select a Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 – 7
Select a Species . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 – 8
Making Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Storing Records . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 – 9
Recalling and Deleting Records . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Compensating for Temperature . . . . . . . . . . . . . . . . . . . . . . . . 9 – 10
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 – 11
Operating & Maintenance Tips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Warranty Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 – 12
Return for Repair Policy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
INTRODUCTION
Thank you for purchasing General Tools & Instruments’ MMD8P Precision Multi-Species Wood
Moisture Meter. Please read this user’s manual carefully and thoroughly before using the meter.
The MMD8P is tailored for use in woodworking and lumber purchasing. Examples include:
• Measuring the moisture content of wood before painting, wallpapering, sealing,
treating or joining
• Selecting dry lumber
The meter infers the moisture level of a piece of wood by measuring the electrical resistance it
presents between the meter’s test pins. The electrical resistance of any material can be used as
a proxy for its moisture level. The wetter a material, the lower its resistance.
The measurements made by the MMD8P mostly represent surface moisture content because:
1) Moisture close to the surface has a greater effect on a reading than moisture deep below it;
and 2) At a length of 0.2 in. (5mm), the pins at the top of the MMD8P are too short to be driven
deep into a hard material.
KEY FEATURES
• Readings are species-specific, derived from industry-standard moisture-resistance
curves for 48 popular species of wood
• Joystick makes species selection fast and easy
• Also measures and displays ambient temperature (in °F or °C) and RH
• Measurements can be compensated for ambient temperature, improving precision
• Super-bright yellow OLED (organic light-emitting diode) dot matrix display
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