The device shows me the wet places in my wall reliably. It does so, what it should. Only downside I find the usability: The battery compartment could be opened only under threat of fingernails. That the plastic cover over the two test prods after removing back again to attach, makes sense, because you moved the small portion else quickly. It there but deducted again requires considerable force, resulting eratischen jerks, which in turn the risk of injury by the two sharp points conjure up that should be precisely prevented by the cover. After having inserted the batteries, it seemed at first as if the unit does not operate. There were shown constant 88% humidity. However, since the device beeped, turning seemed to have worked. Then I came on it that I had to pull the glued on the display foil to see the actual measured value can. This is unfortunately not apparent from the description. As already noticed other reviewers, you have to again and again perform the switching from wood to masonry. Unfortunately, the display is very weak, so you have to look very closely in low light conditions to see if the device has switched to the desired material. The moisture detector is technically good. Due to the poor ergonomics I have to deduct a star.
