My last non contact works but is limited after a drop. There's no adjustments in sensitivity to make this "work" or not. I'm not going to write on if it's precise because my skill set is limited, I intend to use this with household simple fixes investigation. Nothing very sophisticated or high end electronic repair. If my savvy inlaws borrow, it I may update then. For the extra features, it includes instructions on how. If your skill level can't discern them and feel confident, don't use these functions. For continuity, you do need to be powered off, and the length tested in a comfortable/readable arms reach. So this doesn't help for finding a break behind a wall. The non-contact is sensitive enough to sense live voltage behind regular drywall. This requires a AAA battery and a screwdriver to open the battery compartment. The one picture is the brightness under a desk of the light.I've had an item change on me in the far past. At purchase this was called "KAIWEETS Voltage Tester/ 12V-300V Non-Contact and Contact Voltage Pen with NCV, Live/Null Wire Tester, Electrical Tester with LCD Display, Buzzer Alarm, Wire Breakpoint Finder-VT500" This is a new product, so it's description may adjust to suit the product over time. The pictures show what I got.
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