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Extech MO55 – Combination Pin/Pinless Moisture Meter

4.2 4.2 out of 5 stars 649 ratings

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MO55
Moisture Meter

Purchase options and add-ons

Brand Extech
Product Dimensions 2.6"W x 6.7"H
Item Weight 0.27 Pounds
Battery Description AA
Mounting Type Wall Mount

About this item

  • Measure Moisture Level in wood, wall board, sheet rock, cardboard, concrete, plaster, and mortar
  • Moisture Icons provide a visual reference for low, medium, and high levels of moisture
  • Audible Alert Tone beeps faster as moisture level increases
  • Pinless Measurement Mode reads moisture up to 1 inches below the surface
  • Data Hold Function freezes readings on display

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Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 2.6 x 1.2 x 6.7 inches; 4.32 ounces
  • Item model number ‏ : ‎ MO55
  • Batteries ‏ : ‎ 2 AA batteries required. (included)
  • Date First Available ‏ : ‎ July 11, 2016
  • Manufacturer ‏ : ‎ Extech
  • ASIN ‏ : ‎ B01IABHOUE
  • Customer Reviews:
    4.2 4.2 out of 5 stars 649 ratings

Product Description

The MO55 is a combination pin/pinless moisture meter. Take quick moisture measurements on wood and building materials with choice of pin or pinless (non-invasive) Method. Easy-to-operate with display icons that indicate the levels of moisture content Plus audible alert feature. Ideal for building restoration projects and applications where moisture detection on floors, tiles and under carpets is critical. A Must-Have tool for analyzing the after-effects of water leakage behind walls and in ceilings. Complete with pins (2), protective cap, and 9V battery.


From the manufacturer


  • Wood moisture range (pin): 5 to 50%
  • Wood moisture range (pinless): 0 to 99%
  • Other materials (pin): 1.5% to 33%
  • Other materials (pinless): 0 to 99%
  • Resolution: 0.1%
  • Weight: 4.2 oz (120 g)
  • Dimensions: 6.7 x 2.6 x 1.2" (170 x 65 x 30 mm)

Extech’s combination moisture meter allows you to take quick moisture measurements on wood and other building materials using your choice of either the pin or pinless (non-invasive) method. Easy-to-operate, the MO55’s display icons indicate the level of moisture content and it features an audible alert. Ideal for building restoration projects and applications where moisture detection on floors, tiles, and under carpets is critical. This combination moisture detector is a must-have tool for analyzing the effects of water leakage behind walls and in ceilings.

  • Includes pins (2), protective cap, and battery (9V)

Advanced Moisture Measurement Device

Moisture Readings on Multiple Materials

Whether you’re building with drywall, sheet rock, plaster, concrete, or mortar, Extech’s MO500 moisture analyzer provides quick and accurate moisture content readings.

Choose Your Measurement Method

Pin or pinless, the choice is yours. The MO500’s pinless moisture measurement function can take non-invasive measurements up to a depth of 25 mm on a wide range of materials.

Easy to Read Measurements

The MO500 non-invasive moisture meter’s easy to read measurement icons display low, medium, and high levels of moisture content for quick reference.

Audible Alert

Extech’s lightweight moisture meter features an audible alert that beeps faster as higher levels of moisture are detected allowing the user to quickly assess the condition of the building material.

A Must Have Tool For Any Construction Project

Make Sure Building Materials Are Dry:

Using the Extech MO500 combination moisture meter when installing flooring or carpeting allows you to make sure your materials are completely dry prior to installation.

Ensure materials are dry

Assess Risk of Mold

What's in the box

  • Complete with pins (2), protective cap, and 9V battery
  • Product guides and documents

    Looking for specific info?

    Customer reviews

    4.2 out of 5 stars
    4.2 out of 5
    649 global ratings

    Customers say

    Customers like how easy it is to use the humidity meter. They say it is simple and easy to set up. However, some customers have reported issues with the durability of the product, saying it is very unreliable. Customers have different opinions on performance, accuracy, quality, and pins.

    AI-generated from the text of customer reviews

    9 customers mention7 positive2 negative

    Customers find the humidity meter easy to use and read. They also mention that setting it up is simple.

    "...Easy to use and read but don't have another device to compare for accuracy. Appears accurate as I monitored wet areas dry out over several days." Read more

    "...However, it does both non-evasive and evasive testing. Very easy to use. I use it as an extra or back up to my Tramex, Protimeter and Delmhurst" Read more

    "Awesome product. Easy to use and very accurate." Read more

    "...Too much guess too much guesswork to figure out what to do in order to measure different types of materials in different locations on a home...." Read more

    9 customers mention9 positive0 negative

    Customers appreciate the value of the humidity meter. They say it's a great product for the money.

    "...It would be nice if they added an accessory jack. Overall good value. I’ve bought several now." Read more

    "Good results for the money." Read more

    "Works great. Great for price. Just wish it had more material then wood and brick. How about sheetrock." Read more

    "...so far, this is as good as the expensive ones. we shall see how the pins hold up..." Read more

    31 customers mention21 positive10 negative

    Customers are mixed about the performance of the humidity meter. Some mention it's real good when it works, while others say that it stopped working after 10 minutes and the power button didn't work.

    "The pinless function works fine however the pins continually lose contact. I have to constantly retighten the pins but they are not reliable...." Read more

    "Great machine!! We've ordered these several times and always happy with the results." Read more

    "...forward yesterday at a job site and the meter was simply dead - would not turn on. (Also tested with a brand new battery.)..." Read more

    "...Good product - relatively accurate. Pad sensor works well.Pins are not as accurate and you have to jiggle it around to get the reading...." Read more

    13 customers mention8 positive5 negative

    Customers are mixed about the accuracy of the humidity meter. Some mention that it appears accurate, while others say that it's not very accurate and gives inaccurate readings.

    "...Results are highly reproducible and accurate...." Read more

    "...Overall, I am not thrilled with the the meter. The readings are off from the other meters for both invasive and non-invasive reading...." Read more

    "...Good product - relatively accurate. Pad sensor works well.Pins are not as accurate and you have to jiggle it around to get the reading...." Read more

    "...Appears accurate as I monitored wet areas dry out over several days." Read more

    13 customers mention9 positive4 negative

    Customers are mixed about the quality of the humidity meter. Some mention it's a great functioning moisture meter, with a handy testing device inside the pin cap. However, others say that the tool no longer took consistent readings, the sensor only works intermittently, or the meter was simply dead.

    "This is the perfect tool to use in your house to check and make sure there aren’t any leaking pipes or rainwater getting in to your house...." Read more

    "The Extech M0290 is a great moisture meter. It genuinely serves its purpose within the industry. My father has had his for well over 15 years...." Read more

    "...Fast forward yesterday at a job site and the meter was simply dead - would not turn on. (Also tested with a brand new battery.)..." Read more

    "...I also like the testing device is very handy inside the pin cap and not in a separate little baggie that gets lost and no body knows what it is...." Read more

    8 customers mention3 positive5 negative

    Customers have mixed opinions about the pins of the humidity meter. Some like the option of using it with or without pins, and the depth on the pinless mode seems really good. However, others say that the pin is poorly designed, and loses contact. Some customers also mention that the display is not backlit.

    "The pinless function works fine however the pins continually lose contact. I have to constantly retighten the pins but they are not reliable...." Read more

    "...The depth on the pinless mode seems really good...." Read more

    "...Pad sensor works well.Pins are not as accurate and you have to jiggle it around to get the reading...." Read more

    "...The accuracy is subpar, the pins stopped working after a short period of time, and the meter shows a lot of false positives on materials like..." Read more

    22 customers mention5 positive17 negative

    Customers are dissatisfied with the durability of the humidity meter. They mention that it's unreliable, faulty, and broke shortly after purchase. Some customers also report that the quality is suspect and the product is not recommended for professional use.

    "...I have to constantly retighten the pins but they are not reliable. I can now only use it as a pinless meter...." Read more

    "...invest another $175 plus shipping both directions on an apparently faulty product, or invest into a different brand name...." Read more

    "...used as it's the most expensive one I have purchased and the most inaccurate device I have used...." Read more

    "...Unit has been durable and reliable. It would be nice if they added an accessory jack. Overall good value. I’ve bought several now." Read more

    8 customers mention0 positive8 negative

    Customers find the readability of the humidity meter to be difficult. They mention that the cone-shaped meter makes it difficult to get consistent readings, and the readings are variable and non-repeatable. Some customers also report that the meter is not backlit, making it difficult for them to read the reading.

    "...Also, because the display is not backlit, it is very difficult to read. I use this meter in Crawlspaces and attics quite frequently...." Read more

    "...A hair's movement and it loses the reading.Button is on the front and activates/powers it on and off easily if you don't have it in your hands...." Read more

    "...I used it 3 times and the 3rd time it only reads 0% no matter in what mode it is set for...." Read more

    "...The probes are cone shaped making it difficult to get consistent reading or readings that change based on the pressure you apply...." Read more

    Good product, not great
    3 Stars
    Good product, not great
    Bought in November 2021 for professional use in building forensics.Good product - relatively accurate. Pad sensor works well.Pins are not as accurate and you have to jiggle it around to get the reading. A hair's movement and it loses the reading.Button is on the front and activates/powers it on and off easily if you don't have it in your hands. I had in my work bag in its own compartment and would go off randomly all the time.In November of 2023, the power button jammed up on me on a jobsite, beeped on/off for a better part of 30mins, then ultimately just never turned on.Chart on the rear is super useful!Extech instruments was bought by Flir, so maybe they'll work on that.Not getting another one, but good for a first time user.
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    Top reviews from the United States

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    Customer image
    3.0 out of 5 stars Good product, not great
    Reviewed in the United States on January 4, 2024
    Bought in November 2021 for professional use in building forensics.
    Good product - relatively accurate. Pad sensor works well.
    Pins are not as accurate and you have to jiggle it around to get the reading. A hair's movement and it loses the reading.
    Button is on the front and activates/powers it on and off easily if you don't have it in your hands. I had in my work bag in its own compartment and would go off randomly all the time.
    In November of 2023, the power button jammed up on me on a jobsite, beeped on/off for a better part of 30mins, then ultimately just never turned on.
    Chart on the rear is super useful!
    Extech instruments was bought by Flir, so maybe they'll work on that.
    Not getting another one, but good for a first time user.
    Images in this review
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    Top reviews from other countries

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    François Faucher
    5.0 out of 5 stars A-1
    Reviewed in Canada on December 27, 2023
    Style: MO55Pattern Name: Moisture MeterVerified Purchase
    Erika
    5.0 out of 5 stars Fuktmätare
    Reviewed in Sweden on March 13, 2024
    Style: MO55Pattern Name: Moisture MeterVerified Purchase
    Paulo Silva
    5.0 out of 5 stars medidor de grande qualidade
    Reviewed in Spain on October 2, 2023
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    dany gagnon
    5.0 out of 5 stars 5 stars
    Reviewed in Canada on January 3, 2020
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    Kevin broome
    5.0 out of 5 stars Great damp meter amazing price
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