Awarding Strategies using High-Tec Engineering


Moisture Pen + Flashlight

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, remodelers, moisture remediation technicians, pest control professionals, and residential roofing and flooring contractors. Providing reliable and accurate measurements offered at a highly affordable price point, 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.

FLIR MR40 Features

Moisture pen + flashlight

Single-scale moisture meter and flashlight

Pocket portable

MR40 fits in your pocket to easily carry with you

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Simple and reliable

All the features you need including Measurement ‘Hold’, Calibration/Pin Check, and audible indication of measured range

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Drop-tested and IP rated for water resistance

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Replaceable Pins

Includes two sets of pins


Includes Limited Lifetime Warranty

FLIR MR40 Specifications

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 Group9/ Building Materials: plywood, drywall, and oriented strand board (OSB), download the MR40 Material Conversion Table (publication MR40-AN01):
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
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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 (9.8 ft.)
Ingress Protection Rating IP54 Splash Proof
Operating temperature -10 to 60°C (14 to 140°F)
Physical data
Weight 80g (2.8 oz) with Battery
Dimensions (H × W × L) 193 x 26 x 31 mm (7.6″ x 1.0″ x 1.2″)
Material PC-ABS w/TPE Overmold
Color Gray, black