General Tools LCD Moisture Meter #MM8 - Leak and Humidity Detector - Pinless and Non-Invasive

This is a great little moisture reader. I have tried other models and they give you some numbers and different modes for different types of material but what do you do with the numbers??? what is a "normal" reading? etc... I used this to detect possible leaks in the walls. Most moisture meters out there tend to specialize for measuring moisture in wood and various material. This one works really really well for regular dry wall! You drag it slowly along the wall near areas where you suspect there might be a leak. For my part, it discovered that while there was no pipe leak, there WAS a lot of wicking moisture from the grout in the shower to the backing drywall material (an old shower without a waterproof membrane). The meter was VERY clear. In most area, it would show 0% moisture. As I approached the shower, it gradually increased all the way to 100%... There is also a color scale indicator (from green (OK) to RED... bad/wet!). And once you pass a certain level of moisture, the meter will also beep! Like I said... NO AMBIGUITY with this device. It will tell you in simple terms: You are OK or HEY! There is excess moisture in this wall! Verdict: GET IT! Get it if you suspect moisture or water leak in a wall. At about 20% moisture, you may start having some mold in the wall. This meter is affordable... it's worth having one on hand!

This works way better than I expected for the price. Very easy to use. The only thing to be mindful of, it doesn't work for my house along the corners of any walls (I believe that's from the metal trim in the drywall interfering?) . I thought I had a major leak going on around a window until I realized it indicates anywhere there's an edge. But for basic leak detection outside of that, it works very well.

It was not new when purchased,but it works fine and the price discount made it worth it.

The unit worked just fine and was quite useful from mid-March to mid-June. Then, suddenly something happened, and the sensitivity suddenly dropped on all ranges. it still feels the hand, but on the wall, masonry, softwood and hardwood shows only 0, where an hour ago I saw 15 to 55% of moisture. Replaced the battery with fresh one - nothing changes. Opened the case and did not see any broken wire. Actually, pretty nice design and well manufactured (I can tell that being a professional in engineering), but is completely useless now. UPDATE: contacted warranty department and they responded with the advice - recalibrate the unit. Pretty simple operation, and they attached the manual, so took about a minute to do. The unit works fine again, and I love the customer support!

It seems to me that the results are not very precise, they vary a lot with other instruments of greater precision, if I put them in direct contact with a surface such as dry concrete, 80% humidity appears, I do not know if the measurement should be done without touching the surface and depending on the distance the results vary, there is no manual for performing a correct measurement method.

Given as a gift. Report from the recipient great job.

Nice product and run well for moisture measuring

Very helpful tool. Easy to use. Has saved us from tearing out walls unnecessarily.

Works great better than the one I bought from the hardware store

ممتاز وعملي وافادني لمعرفة موقع تسريب الماء.

Llegó en tiempo y rápido, el producto como tal es bueno había leído comentarios de que no servía e hice pruebas antes de usarlo en el trabajo y sí funciona. Es a base de campo electromagnético que lo hace no invasivo y creo que eso mismo es lo que reduce su rango de humedad y también depende del material en el que se use, es ideal para mampostería de block, tabiques..., concreto simple, y madera. Y más que tomarlo como un porcentaje de humedad funciona como un sí hay humedad (suena) o No hay humedad (no suena).

Reading is 100% on every single wall and surface in my house. How is this possible? I'm not Spongebob Squarepants.

Use this on any surface and the readings will be high. Compared against a probe type its a mile out. Completely useless.