FLIR MR40 Moisture Pen


The FLIR MR40 is a pocket-portable, rugged 2-pin, single-scale moisture meter with an integrated flashlight for wood and common building materials – ideal for builders, building inspectors, re-modelers, moisture remediation technicians, pest control professionals, and residential roofing and flooring contractors. Providing reliable and accurate measurements offered at an affordable price, MR40 is a quick and easy-to-use tool to find and quantify moisture content.

When used in combination with a thermal camera, MR40 can help confirm whether a cold spot in a thermal image is moisture, and measure the severity of the problem.

Authorised Australian Distributor

pdf    MR40 Datasheet

pdf    MR40 Materials Application Note


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FLIR MR40 Moisture Pen Features:


The FLIR MR40 Moisture Pen and Flashlight is equipped with a clear LCD display, a simple On/Off button with ‘Auto Power Off’, replaceable pins, and an audible indication of measured range, the MR40 is a simple and effective tool for reliable measurements.



The FLIR MR40 Moisture Pen and Flashlight is small enough to carry in your pocket, IP54 splash-proof rated, and 3-meter drop tested, so it’s always ready to work when — and wherever— you are.



The FLIR MR40 Moisture Pen has all the essential features you need to quickly verify moisture and determine the severity of the problem including a measurement ‘hold’ function and calibration/pin check integrated in the cap.



Measurement Range 5% to 60% MC (Moisture Content)
Measurement Accuracy 5 to 30% MC (Moisture Content): +/- 2%
30- 60% MC (Moisture content): Reference only
Note: For materials other than Group 9/ Building Materials: plywood, drywall, and oriented strand board (OSB), download the MR40 Material Conversion Table Application Note above.
Audible Indication 5-12%: Low Beep rate. 13-60%: Higher beep rate.
More than 60%: Highest Beep rate (Display OL)
Calibration/ Pin Check, Integrated in Cap 16%
Meter data
Work light ~40 lumens
Display LCD
Electrode pins Integrated, Replaceable
Measurement Principle Electrical Resistance
Warranty Limited Lifetime
Calibration cycle N/A
Certifications CE
Power system
Power requirements 2 × AAA alkaline batteries
Battery life 70 Hrs w/o Flashlight
Battery status indicator 4 Bar battery icon
Auto Power Off (APO) 3 minutes
Environmental Data
Drop test 3 m
Ingress Protection Rating IP54 Splash Proof
Operating temperature -10 to 60°C
Physical data
Weight 80g (2.8 oz) with Battery
Dimensions (H × W × L) 193 x 26 x 31 mm
Material PC-ABS with TPE Overmold
Color Gray, black


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