FLIR MR40 Moisture Pen Review

Written By Kim Goodwin is reader supported. When you buy through links on our site, we may earn an affiliate commission at no cost to you.

moisture meter is an essential tool for those who want to dry their wood or buildings or other equipment. Many people use the moisture meter to measure the water content of their walls, concrete, wood, and some other models.

Moisture meter has an essential part of the building contractors, inspectors, woodworkers, and DIYers. Moisture can heap on the surfaces for some reasons like humidity, water intrusion, and condensation. It occurs naturally or mechanically while opening the windows, doors.

Moisture may affect your home, wood products, or garden decking. It can lead to expensive damages if you don’t take any remedy. You should keep the firewoods or log burner away from the moisture. If it gets wet, then you and your family might be struggling during the harsh winter seasons. 

Having a moisture meter will recover all these problems simply, and you don’t need to worry about the moisture problems. But it is hard to find the best moisture meter for your needs in the market. We know that is the challenge for everyone who is searching for a moisture meter; hence we’ve done this review to help you to choose the best moister meter. After reading this, you can get a clear view of the moisture meter.

About FLIR

FLIR is one of the leading thermal imaging manufacturing company for a decade. It produces lots of thermal imaging products from traditional thermal imaging cameras like thermal imaging monoculars, scopes, and cameras for scientific and professional researches. FLIR provides the best warranty for the customers in the industry to show the commitment in the quality. It has one of the thermal products for the homeowners, building inspectors, contractors, and tradesmen are moisture meter.

FLIR MR40 – Moisture Pen Review

FLIR MR40 is a single scale moisture meter with a built-in flashlight that allows you to measure the moisture content. It helps you to detect the moisture problems easily and saves you from investing thousands of dollars for the interior or structural damages. It comes with a portable, rugged two-pin and common building design.

Arctic Silver 5 Thermal Paste


  • Material: PC-ABS w/TPE overmould
  • Dimensions: 1 x 1.2 x 7.6 inches
  • Weight: 2.88 oz
  • Display: LCD
  • Measurement Range: 5 to 60%
  • Operating Temperature: 14 to 140 F
  • Battery Life: 70 hours

It is ideal for the builders, building contractors, inspectors, residential roofing and flooring contractors remodelers, moisture, and pest control technicians. It provides accurate and reliable measurements at an affordable price. The MR40 moisture pen is easy to use tool to find the moisture content. Let’s see the brief review of the FLIR MR40 Moister Pen.


The MR40 comes with the many advanced features that the topmost models have. With these features, it can easily find out where the moisture problem occurs and also displays the quantity of the moisture content via the LCD display.


The FLIR MR40 moisture pen is designed like a pen with a portable, rugged, and convenient design; hence you can carry this in your pocket wherever you go. It is IP54 splash-proof rated, and 3-meter drop tested, so it works anywhere in any condition. This moisture meter works at a temperature of 14°F to 122°F  to manage the difficult jobs.

Reliable and Accurate Measurements

MR40 moisture meter contains the required features to identify the moisture content accurately and determine the hardness of the problem quickly. It includes the measurement ‘hold’ function and Calibration/Pin check integrated with the cap.

Easy to Use

The MR40 moisture meter comes with the LCD screen that displays the moisture content of the product you check and it gives an audible sound based on the detection range like 5-12%, 13-60%, and 60%+. It has the simple on/off button with the auto power button, an audible indication of the measured range, and the replaceable pins to make the easy operation without struggles.

FLIR MR40 is a simple and effective tool for reliable moist measurements. When combined with the thermal camera, the MR40 moisture meter helps you to find the place is cold or not.


The MR40 is ideal for building inspectors that helps to detect the moisture content and determine the reports of their findings for analyzing the area to repair. With this moisture meter, the homeowners can check the areas of moisture to prevent the damages. Moreover, it can be used to confirm that the repairs have been done in your foundation or the affected area, and it won’t allow the moisture into your home.

Key Features

  • Built-in Flasshlight
  • Rugged design
  • Contains LCD display
  • Auto Power Off
  • IP54 Splash-Proof


  • Packet sized
  • Easy to use
  • Accurate measurements


  • Dim display
Measurement MethodsPin, PinlessPin, PinlessPin, PinlessPin, PinlessPin, PinlessPin, Pinless
Materials TestedBrick, Cardboard (Building Material), Concrete, Plaster, Sheet Rock, Wall Board, WoodBrick, Cardboard (Building Material), Concrete, Plaster, Sheet Rock, Wall Board, WoodBrick, Cardboard (Building Material), Concrete, Plaster, Sheet Rock, Wall Board, WoodBrick, Cardboard (Building Material), Concrete, Plaster, Sheet Rock, Wall Board, WoodBrick, Cardboard (Building Material), Concrete, Plaster, Sheet Rock, Wall Board, WoodBrick, Cardboard (Building Material), Concrete, Plaster, Sheet Rock, Wall Board, Wood


Are you looking for the portable moisture meter for your home or building inspections, wood, and other materials, FLIR MR40 is the best choice for your needs. The MR40 is suitable for those who need the moisture meter for their daily use to complete the task. We recommend this FLIR MR40 for you that will help you to detect the moisture content accurately. We hope this review will help you to clarify the moisture meter and choose the right moisture meter for your needs.

About Kim Goodwin

Kim Goodwin holds a Master's in thermal engineering from the University of Rhode Island. At Thermo Gears, she reviews most equipment that uses thermal imaging technologies.

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