Keeps fluctuating on the screen, I can't decect anything on 1K and 100HZ frequency step. It only works on 200K when I try to detect it, and for it to work key needs to touch antena. If key is even 5cm away it doesn't detect anything and says no signal. Item description says it should detect signal from 5m, but I checked 3 different keys which open cars from far away with strong battery, but this frequency meter won't detect them unless they are touching antena. Disappointed.
Tested with familiar items, but all were detected. The frequency error is within the allowable range and is very easy to use! Thank you seller!