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

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.

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.

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.

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.

Buen producto

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.

Very easy to use.We used this to check for moisture in an exterior wall of our rental. Very happy with our purchase.

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.