Search  for anything...
General Tools

General Tools MMH800 Pin/Pinless Moisture Meter w/Temp and Humidity

  • Based on 621 reviews
Condition: New
Checking for the best price...
$119.20 Why this price?
Save $10.79 was $129.99

Buy Now, Pay Later

As low as $19.87 / mo
  • – 6-month term
  • – No impact on credit
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, PayTomorrow, Affirm, Afterpay, Apple Pay, and PayPal. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Free shipping on this product

FREE 30-day refund/replacement

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: In Stock.
Fulfilled by Amazon
Arrives Sunday, Sep 7
Order within 15 hours and 40 minutes
Available payment plans shown during checkout

Recently Viewed

Features

  • HUMIDITY SENSOR: Our combo meter tool can quickly determine what level of remediation is needed to keep your family safe from black mold. High levels of dampness that go untreated are the leading cause of harmful fungus growth in the home.
  • WATER LEAK DETECTOR: Finding the moisture content in your floors, plastered walls, and wood is the first step in early prevention. Continuously check and test suspicious water stains around the house so you can determine if the area is wet or dry.
  • MOISTURE READER: The mold test features 2 dedicated displays, moisture percentage, ambient temperature, and relative humidity. Our mildew scanner includes audible and visual indications of high, medium, and low moisture levels with a F/C switch.
  • MOLD TESTER: This tool features both pin-type and pinless (flat pad) surface sensors for an accurate test read on larger areas. Once moisture patches are detected, flip open the cap to expose the pin sensors for more exact content readings.
  • GENERAL TOOLS: We're a recognized leader in designing and developing specialized precision tools dedicated to delivering exceptional customer service. We encourage artisans and DIYers to work smarter, measure better, and repair more productively.

Description

You can count on our General Tools 4-in-1 Digital Moisture Meter to give you the most accurate readings when it comes to tracking down pesky mold in your home. Our humidity tester provides a moisture level range of 5% - 50% in wood and 1.5% - 33% in building materials, such as concrete and drywall. It has an auto diagnostic check and auto power off after 3 minutes and includes a solid 9-volt battery. The gauge also comes with a lanyard, 2 sets of spare pins, and a user's manual. The sturdy, ergonomic shape and rubber side grips allow for comfort even when using for multiple measurements. Every mold detector has a hold function, saving a read to view later. At General Tools, we offer over 1,000 products to choose from. We're proud to provide merchants, artisans, and DIYers worldwide with a broad range of affordable, specific-purpose mechanical hand tools and precision measuring and inspection gear.

Brand: General Tools


Product Dimensions: 3.63"W x 8.13"H


Battery Description: 9V


Mounting Type: Surface Mount


Upper Temperature Rating: 1.3E+2 Degrees Fahrenheit


Brand: ‎General Tools


Product Dimensions: ‎3.63"W x 8.13"H


Battery Description: ‎9V


Mounting Type: ‎Surface Mount


Upper Temperature Rating: ‎1.3E+2 Degrees Fahrenheit


Voltage: ‎9 Volts


Temperature Accuracy: ‎±3°C


Manufacturer: ‎General Tools


UPC: ‎031113272343 031111204117 681035014868 031113186343


Global Trade Identification Number: ‎68


Part Number: ‎MMH800


Item Weight: ‎1.94 pounds


Item model number: ‎MMH800


Is Discontinued By Manufacturer: ‎No


Size: ‎Pin Type or Pinless


Style: ‎Pin Type or Pinless


Material: ‎HAWA


Pattern: ‎Digital Moisture Meter


Power Source: ‎Corded-electric


Item Package Quantity: ‎1


Number Of Pieces: ‎5


Measurement Accuracy: ‎+/-0.1%


Included Components: ‎General Tools MMH800 4-In-1 Combo Moisture Meter, Batteries


Batteries Included?: ‎Yes


Batteries Required?: ‎Yes


Battery Cell Type: ‎Alkaline


Description Pile: ‎9V


Warranty Description: ‎1 year parts


Date First Available: June 28, 2011


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Sunday, Sep 7

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Reasonably Reliable Tool
Pattern Name: Digital Moisture Meter
Review Image by MDK MDK
Review Image by MDK MDK
I'm a general contractor and I find myself occasionally having to test for moisture in a client's home. This is my second General Tool moisture meter. This model - the MMH800 - has more functions then my previous one including the ability to test for moisture as well as providing a temperature readout. The meter is a dual-function pin and pin-less model which allows testing without leaving holes in walls or woodwork. I had the opportunity to be on a customer site with a mold remediation tech who was taking moisture readings to determine possible wet areas that might have been contributing to a mold issue. The tech didn't tell me the model he was using other than it was a professional -series, scan-only type and that it was very accurate with a good scan depth. When I compared my readings from the MMH800 with the tech's meter I found very little differences in the readings. There is one inherent limiting factor with all pin meters and that is they only test to the depth of the pins, useful on drywall or wood but very limited on masonry and/or concrete. Concrete testing is virtually unreliable due to the penetration issue. The ability to take a scan reading alleviates some of that issue. What I like most about the MMH800 is that is reasonably accurate and affordable. Adding a moisture meter (along with a good gas sniffer) to my tool bag provides data which ultimately allows me to better serve my customers. ... show more
Reviewed in the United States on May 4, 2024 by MDK MDK
    • Good mid-level meter
Pattern Name: Digital Moisture Meter
This is a solid performing meter a step above the baseline meters plus it has a built-in display for temperature and humidity which is handy especially when measure moisture in attics and crawlspaces.
Reviewed in the United States on November 29, 2024 by Mark S.
    • Functionality
Pattern Name: Digital Moisture Meter
Have purchased this before but returned it last time as I couldn't get the calibration process to work or it was malfunctioning. This time I realized using the longer pins that I cannot put the cap back on. This kind of defeats the purpose in addition to only having it 6 months or less and the calibration does not appear to be working for either the wood or bldg materials range. Will be reaching out to warranty dept. Been tough finding a good moisture meter that lasts. ... show more
Reviewed in the United States on January 12, 2025 by sean whittaker
    • Lasted About 3 Months
Pattern Name: Digital Moisture Meter
Save your money. I'd had some cheaper moisture meters I wasn't happy with, so I decided to buy something a little more expensive. In my experience, General Tools has a pretty middle-of-the-road reputation, but this $100 model seemed like a good compromise between a cheapie and one of the high-dollar models. For a while I thought I'd made a good decision, but after about three months (using it two or three times a week) it started giving me weird readings. Shortly after that, it just started telling me everything I tested had 0% moisture. Changing batteries didn't help. For some reason, I decided to give them a second chance, and I bought another. My bad. It did the exact same thing, except this time it only took a month or so to get to the 0% readings. Now I have to decide if I'm going to try some other mid-range brand or spend some real money. ... show more
Reviewed in the United States on March 23, 2025 by T Butler
    • Lo recomiendo
Pattern Name: Digital Moisture Meter
Buen producto
Reviewed in the United States on March 21, 2025 by Mirian Gonzalez
    • OK
Pattern Name: Digital Moisture Meter
Not near as accurate as I expected it to be. The temp and humidity readings are very slow to respond. Seller was great product is only so so.
Reviewed in the United States on August 26, 2025 by Amazon Customer
    • Worked perfect!
Pattern Name: Digital Moisture Meter
Very easy to use. We used this to check for moisture in an exterior wall of our rental. Very happy with our purchase.
Reviewed in the United States on March 29, 2024 by Cyn Dee Bee
    • As advertised
Pattern Name: Digital Moisture Meter
I've now used this tool many times. It appears to be very accurate. It's very easy to use. I like the ability to calibrate the tool before using it. I would recommend this to anyone looking for a similar tool. I would buy this again.
Reviewed in the United States on January 26, 2023 by nalehpr

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for best price...