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General Tools Relative Humidity Moisture Meter, Model MMH800

Item #417767 General Tools
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Product Information:

This General Tools 4-in-1 PIN/PAD Relative Humidity Moisture Meter is ideal for locating water leaks and measuring moisture content of lumber, unfinished wood, drywall, plastered walls, carpeting, floors and subfloors, brick, grout, soil, paper or powders. Measurement accuracy/resolution +/-3%/0.1% with a 3/16" long pin.


  • Pin-type and flat surface (non-intrusive dualpad) sensors

  • Two dedicated displays: Moisture percentage, and ambient temperature plus relative humidity

  • High accuracy and repeatability

  • High/medium/low audible indication of moisture level

  • Holds moisture level readings for convenient viewing later

  • Auto diagnostic check

  • Auto power off

  • Battery charge indicator

  • Specifications

  • Measurement Ranges: 5 to 50% moisture(wood); 1.5 to 33% moisture (building materials)

  • Moisture Measurement Accuracy: ±3%

  • Moisture Measurement Resolution: 0.1%

  • Pin Length: 3/16 in. (5mm)

  • Temperature Measurement Range/Accuracy: 32° to 140°F (0° to 60°C)/±2°F (±2°C)

  • Humidity Measurement Range/Accuracy: 25 to 95%/±3% from 0° to 40°C

  • Auto Power Off: After 3 minutes of inactivity

  • Storage Temperature: 23° to 140°F (-5° to 60°C)

  • Storage Humidity: 80% max 

  • Includes : MMH800 Moisture Meter, 9V Battery, Two Sets of Extra Pins, and User's Manual.

    Shipping / Billing Info:

    This product ships direct from the manufacturer:
    • Your order will ship in approximately 5 business days.
    • This product is considered special order. Your account will be charged when you place your order.
    • Express or overnight shipping is not available for this product.
    • Ships by Ground to the 48 contiguous states. Cannot ship to Alaska, Hawaii, PO Boxes, APOs, US Territories, Canada or other foreign countries.

    Return Information

    If you have a return issue, contact Woodcraft Supply customer service @ 1-800-535-4482 for return details. RGA required. Return subject to 20% restock fee. Customer responsible for return freight.

    If purchased at a Woodcraft Store, please return the item directly to the store where your purchase was made.

    Warranty Information

    General Tool warranties their items for one year.  Contact Woodcraft Customer Service for assistance at 800-535-4482.

    California Residents: Click here for Proposition 65 information.