I have to admit I was a little skeptical due to some negative reviews and low price but decided to give it a shot. So yes, you can't just blindly trust to first detection signal you get as you might get different results. But you can ensure overlapping results to ensure you get right reading. To do this I used two passes: Stick on wall 2 horizontal lines of painters tape, so that second one is below first one (in my case ~20 cm just to prevent if I hit some horizontal obstructions behind the wall) 1. First pass is to go with device left to right and mark (both beginnings and ends) on painters tape where you get reading, then do in opposite direction from right-left. If marks are matching than you're probably already ok. 2. On second line below repeat same procedure. That's it, find where you see overlapping and this is your studs. Aim to drill in the middle between begging and end markings and there you go. If you still have doubts, on every measurement tape there is little triangles with standard distance between studs, so you can check this as well against your markings. It should match.

Works as expected. I used their 9V battery. I had some trouble inserting the battery and closing the bay cover as the wires seemed to get damaged as I pushed the battery inside. They should make the wire flush with the inner surface so that the battery doesn't damage the wires when pushed inside. I managed to put the wire on top and close the lid. But it works as expected.

works well

Works great without issues!

A tool I've never hade in my workplace. A great addeition Bob

Had on e before and they work great. Needed to purchase a new one because I broke the clip on the battery department.