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

Good product! I chose this because it can measure 3 functions (moisture, RH and temperature) and has pin and pinless options. Work with acceptable accuracy, enough to detect wet areas.Recommendation for manufacturers: The lid does not fit when using the 10 mm pins, it was designed only for 5 mm pin.I recommend this product very well. Others are worth 4-5 times more!

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.

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.

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.

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.

I bought this meter to check moisture content in prefinished hardwood flooring in my house and the subfloor. The prefinished flooring was well dried -- it must have a moisture content of about 6%, maybe less. But this meter bottoms out at 5% and gives no reading or varying readings close to that, especially in hardwood. With the plywood subfloor and other pine lumber, the meter works reliably, but not on the kiln-dried hardwood -- it is too dry. I have access to some home-milled oak and walnut that has been stored outside, and the meter worked well on that, giving readings of 12-15%. New, undried, construction lumber also produced expected readings. So, this meter does work, but be aware that it may not work well a the very dry end of its range.

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

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.