$111.86
Save $8.13
was $119.99
Buy Now, Pay Later
As low as
$18.64
/ mo
Learn more
- – 6-month term
- – No impact on credit to apply
- – 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, Affirm, Afterpay, Zip, Apple Pay, and Google Pay. No-credit-needed leasing options through Acima may also be available at checkout.
Learn more about financing & leasing here.
Free shipping on this product
30-day returns
Learn more
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.
Arrives
Nov 8 – Nov 9
Recently Viewed
At a glance
- Condition
- New
- Model
- MMH800
- Dimensions
- 3.63 x 8.13 x 12 in
- Weight
- 1.95 lb
- Material
- HAWA
- Size
- Pin Type or Pinless
- Pattern
- Digital Moisture Meter
- In the box
- General Tools MMH800 4-In-1 Combo Moisture MeterBatteries
- Warranty
- 1 year parts
Features 5
- 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.
Specs 17
| Manufacturer | General Tools |
|---|---|
| Part Number | MMH800 |
| Item Weight | 1.95 pounds |
| Product Dimensions | 3.63 x 8.13 x 12 inches |
| Item model number | MMH800 |
| Size | Pin Type or Pinless |
| Style | Pin Type or Pinless |
| Material | HAWA |
| Pattern | Digital Moisture Meter |
| Power Source | corded-electric |
| Voltage | 9 volts |
| Item Package Quantity | 1 |
| Number Of Pieces | 5 |
| Measurement Accuracy | +/-0.1% |
| Mounting Type | Surface Mount |
| Battery Cell Type | Alkaline |
| Description Pile | 9V |
No specs match.
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Nov 8 – Nov 9
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.
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
- Zip Pay in 4
- Financing through Apple Pay
- Financing through Google Pay
Learn more about financing & leasing here.
Similar Products
Top Amazon Reviews
Reasonably Reliable Tool
Pattern Name: Digital Moisture Meter
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
Seems to work
Pattern Name: Digital Moisture Meter
Seems to work as described, Haven't used it much yet. Hope to use it and give a better review
Reviewed in the United States on October 15, 2025 by R
A very good tool
Pattern Name: Digital Moisture Meter
I found this to be a very useful tool. I have not used it a lot but compared to a moisture meeter I already own it seems to be quite accurate. The temp and humidity gage is very useful to me. Going in to a home to diagnose moisture problems I need the temp and humidity in the house. The down side is it seems to take some time to acclimate the gage to the inside conditions. I wanted a non invasive meeter to check and not damage flooring and other surfaces. It seems to work OK but not as well as well with the pins. So it may take a little getting used to. Over all for the money I believe this is a good meeter.
...
show more
Reviewed in the United States on April 8, 2012 by Dakota
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
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.
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
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
OUt of the box on the job for all to record...great tool !
Pattern Name: Digital Moisture Meter
Great out of the box on the job tool for flood claims in Houston and Beaumont, Tx. Scoped 7 Churches and substantiated their moisture condition, Display allowed all parties to identify and quantify conditions for the records in the flood claims. Only problem I have had is it gathered legs and disappeared... Have to replace it.
...
show more
Reviewed in the United States on September 30, 2017 by Garfang