Seems to work in my application (homemade winder). Interestingly, it seems to work whether batteries are installed or not (there doesn't seem to be an "off" - definitely not an off button, and the indicator is lit whether batteries are installed or not). There are no instructions, the battery compartment is difficult to open. It would be nice if it could be powered by a "wall wart" power supply. Maybe the power isn't needed - again, the instructions wouldn't hurt.
ICQUANZX LCR-T7 Transistor Tester: Advanced TFT Diode Triode Capacitance LCR ESR Meter
14 Review
Xiaomi iHealth Meter Thermometer White
24 Review
Thermometer B.Well WF-4000 white
57 Review
VIVREAL 4 In 1 Stud Finder Wall Scanner With LCD Display - Center Finding Beam Finder And Sound Warning For Wood, AC Wire, And Metal Studs (Black/Silver)
24 Review