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

Icon - Worklights

Simple and reliable

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

Icon - Durable


Drop-tested and IP rated for water resistance

Icon - Bluetooth

Replaceable Pins

Includes two sets of pins


Includes Limited Lifetime Warranty

FLIR MR40 Specifications

Measurement Range5% to 60% MC (moisture content)
Measurement Accuracy5 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 Indication5-12%: Low Beep rate. 13-60%: Higher beep rate.
More than 60%: Highest Beep rate (Display OL)
Calibration/ Pin Check, Integrated in Cap16%
Meter data
Work light~40 lumens
Electrode pinsIntegrated, Replaceable
Measurement PrincipleElectrical Resistance
WarrantyLimited Lifetime
Calibration cycleN/A
Show less…
Power system
Power requirements2 × AAA alkaline batteries
Battery life70 Hrs w/o Flashlight
Battery status indicator4 Bar battery icon
Auto Power Off (APO)3 minutes
Environmental Data
Drop test3 m (9.8 ft.)
Ingress Protection RatingIP54 Splash Proof
Operating temperature-10 to 60°C (14 to 140°F)
Physical data
Weight80g (2.8 oz) with Battery
Dimensions (H × W × L)193 x 26 x 31 mm (7.6″ x 1.0″ x 1.2″)
MaterialPC-ABS w/TPE Overmold
ColorGray, black