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FLIR MR40 Moisture Pen and Flashlight

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.

Next Day Delivery (subject to availability)

£47.00 exc. VAT £56.40 inc. VAT £64.80 inc. VAT
  • Hold Function
  • LED Flashlight
  • Range 5% to 60% Moisture Content
  • Rated IP54
  • Multi-purpose tester
  • Integrated, Replaceable Probes
  • LCD Display
  • Audible Indication
  • FreeDelivery
  • 30DayMoneyBack
  • Description
  • Features & Specification
  • Resources
  • Delivery

FLIR MR40 Moisture Pen and 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 Moisture pen Comes Supplied With:

  • 2 x AAA Batteries
  • Spare set of pins


Easy to use

Simple and effective tool for reliable measurements

  • Clear LCD display 
  • Simple On/Off button with ‘Auto Power Off’ 
  • Replaceable pins (includes 2nd set) 
  • Audible indication of measured range (5- 12%, 13- 60%, 60%+)


Convenient, portable rugged design

The MR40 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.

  • Small enough to carry in your pocket and take measurements in tight spaces
  • IP54 splash-proof rated, operating temperature: -10°C to 50°C
  • 3-meter drop tested


Reliable and accurate measurements

The MR40 has all the essential features you need to quickly verify moisture and determine the severity.

  • Measurement 'hold' function and calibration
  • Pin check integrated in the cap.


About FLIR

FLIR Systems - The World's Sixth Sense

FLIR Systems, Inc. designs, develops, manufactures, markets, and distributes technologies that enhance perception and awareness. We bring innovative sensing solutions into daily life through our thermal imaging systems, visible-light imaging systems, locator systems, measurement and diagnostic systems, and advanced threat detection systems. Our products improve the way people interact with the world around them, enhance public safety and well-being, increase energy efficiency, and enable healthy and entertained communities.

FLIR MR40 Moisture Pen
Measurement Range 5 to 60% MC (moisture content)
Measurement Accuracy 5 to 30% MC: ±2%
30 to 60% MC: reference only

Note: for materials other than group 9/Building materials plywood, drywall, and oriented strand board (OSB), download the MR40 material conversion table (publication MR40-AN01) from the FLIR website
Audible Indication 5 to 12%: low beep rate
13 to 60%: higher beep rate
More than 60%: highest beep rate (display OL)
Calibration/Pin Check 16%
General Specifications
Torch 40 lux
Display LCD
Electrode Pins Integrated, replaceable (4 pins included)
Measurement Principle Electrical resistance
Warranty Limited lifetime
Calibration Cycle N/A
Battery Type 2 x AAA batteries (included)
Battery Life 70 hours without torch
Battery Status Indicator 4 bar battery icon
Auto Power Off 3 minutes
Drop Test 3m (9.8ft)
IP Rating IP54 splash proof
Operating Temperature -10 to 60°C (14 to 140°F)
Weight 80g (2.8oz) with batteries
Dimensions 193 x 26 x 31mm (7.6 x 1.0 x 1.2")
Material PC-ABS w/TPE overmould

Orders requiring calibration 

Whilst we take the greatest care to get all orders dispatched and delivered to you in the stated time frame, orders received PM and requiring
calibration may on occasion miss dispatch that day, according to the complexity of the calibration. Be assured they will ship on the next dispatch
this in most cases should not add more than 24 hours to your delivery.

Bank/Public Holidays

Predicted delivery times are based on regular trading days Monday to Friday. Public holidays, bank holidays and weekends are outside the usual scope 
of our dispatch and subject to activities/holidays of our carriers and therefore may incur additional days lead time to your order.

*UK Mainland (Temporarily revised June 2020)

Please note that regrettably, we have had to realign our delivery service options to those available from our carriers.
During the current situation surrounding the effects of the Coronavirus pandemic, logistics from every company are under immense pressure to deliver goods on time.
We have taken the decision to temporarily limit our services rather than let our customers down.
We hope you will understand our position on this and we apologise unreservedly for the inconvenience we know this will cause.
We look forward to restoring our full delivery service schedule just as soon as we are able.

Standard FREE 1-2 Day Courier Delivery – UK Mainland only - Zones A & B

Included in the price for all orders over £75.00 (exc vat). Sent using express courier, delivered within 1-2 working days from the date of your order, subject to availability.


Next Day Anytime Delivery (Excluding Saturday & Sunday) – UK Mainland only - Zones A & B
Sent by express courier, delivered next day (excluding weekends) from the date of your order, subject to availability.


Orders must be placed before 3:00pm for a qualifying next day delivery and a telephone number supplied, subject to availability.

New Postage Map Sept 2018>

Delivery Surcharges

Because of the high cost of carriage, we need to apply a surcharge on all deliveries made in the following regions bringing the carriage charges to:

  • Zones A & B  - Mainland delivery rates apply. 
  • Zone C - Scottish Highlands (Charges are calculated at the checkout).
  • Zone D - Outer Hebrides, Orkney Isles, Shetland Isles, Isle of Man, Scilly Isles, and Channel Islands (Charges are calculated at the checkout).
  • Zone E - Northern Ireland (Charges are calculated at the checkout).
  • Zone F - Republic of Ireland (Charges are calculated at the checkout).

Offshore Services

All offshore deliveries are a 2 day service as standard. This includes Channel Islands, Northern & Southern Ireland, Scottish Islands, Isle of Man and the Scilly Isles.

International Delivery

International delivery charges are automatically added to your order at the checkout. For any questions regarding international deliveries please contact us at


All export inquiries should be directed to the export division before placement of order.

If no shipping option is available to your selected country please call us FREE on 0800 0224 060 to purchase your items.
All stated prices are subject to VAT at the current rate where applicable E&OA