Add $175.00 for FREE shipping
Shop All!
Connector Type
SD Card Connectors
USB Connectors
Tool Type
Moisture Detection
SD Card
Battery Operated
LCD Display
Ease of Installation
Beginner (Installs < 10 minutes)
Extech Instruments
Other Ways to Shop
In Stock
On Sale
Order the Smarthome Catalog

Non-Invasive Moisture Reader Leaves No Surface Damage After Measurements
Extech Instruments MO257 Pinless Moisture Meter
Extech Instruments MO257 Pinless Moisture Meter
Click for larger image and other views
Detects moisture up to 0.78
Extech Instruments MO257 Pinless Moisture Meter
Item# 90230
Price: Normally $209.99 
Hot Deal $177.10
Free shipping on orders over $175 - See Details


  • Detects moisture up to 0.78" (20 mm) below the surface
  • 0 to 100 with 0.1 resolution
  • Easy to read backlit LCD display
  • Automatically calibrates when powered on
  • Adjustable visual and audible alarms when high risk situations are detected

Essential Info

With this pinless meter, you will be able to read moisture levels in various materials without creating holes with pins and probes. It uses high frequency sensing technology to detect water over ¾ of an inch under the surface. When the meter is powered on in dry air, it automatically calibrates to ensure an accurate reading every time. Readings are clearly displayed on the backlit triple LCD display. Two alarm levels can be adjusted as need to provide audible and visual indicators when the meter determines a material to be wet or at risk. Three AA batteries (included) are required to power the meter. A low battery indicator informs you when battery level gets low. The meter will also automatically power off after a period of non-use to prolong battery life.


What's Included

  • 1x - Pinless Moisture Meter
  • 3x - AA batteries
  • 1x - Pouch case

  • Specifications

    ManufacturerExtech Instruments
    Manufacturer Product No.MO257
    Moisture RangeRange: 0 to 100
    Accuracy: Relative Only
    Measurement Depth20 to 40mm (0.79 to 1.57")
    Display TypeBacklit LCD
    Display Digits3 numeric displays;each displaying from 0 to 100
    Display IconsHOLD, DRY, RISK, WET, MIN, MAX, and low battery icon
    Operating Temperature40 to 100 degrees F (4 to 43 degrees C)
    Operating Humidity90%, 32 to 86 degrees F (0 to 30 degrees C)
    75%, 86 to 104 degrees F (30 to 40 degrees C)
    45%, 104 o 122 degrees F (40 to 50 degrees C)
    Power Supply3 1.5V AAA batteries
    Auto Power Off (APO)After 30 minutes of inactivity
    Dimensions9.2" x 2.5" x 1.1" (235mm x 63mm x 28mm)
    Weight7.7 oz (218 g)
    Important notes:
    Only defective exchanges for identical item within 30 days of purchase. No other returns allowed on this item. For defective returns after 30 days, please contact the manufacturer.
    Manufacturer contact information: Extech Instruments Corp, Tel: (781) 890-7440 Ext 200


    Detects moisture up to 0.78" deep       
    Detects moisture up to 0.78" deep       



    Sony Alkaline AA batteries       
    Sony Alkaline AA batteries       

    Related Items

    Sign-up for Exclusive Email offers 
    How to Order Track Your Package Shipping Returns Contact Us Customer Service Retail Store
    Getting Started Learning Center FAQ Dealers Customer Testimonials Affiliate Program
    About Us INSTEON Press Awards Employment Guarantees Security & Privacy
    Free Catalog Email Newsletter Forum RSS Site Map
    Have questions? Call us at 800-762-7846 (Mon-Fri 5am-7pm and Sat 6am-3pm PT) or send us a message
    Place your order by 3pm PT for same day shipping
    Copyright 1995-2014 SMARTHOME™
    Verisign Secure Site PayPal Acceptance Mark