Instruct: Classify a given Amazon review as either positive or negative.
Query: tricky auto sensitivity

I just got the Zircon CF12 and tried it for the first time. It has an "continuous automatic calibration" function. According to the instructions on the unit, you "scan over all circuit breakers" then "rescan until the green LED only lights over one breaker. Rescanning causes unit to learn which signal is strongest." I found this setup a bit tricky to use for the first time. It also means that it cannot be used to find other plugs on the same circuit, or to find wires in walls, as people do with the manually calibrated units.Also, the unit cannot really distinguish the two sides of half-width breakers. Maybe I'll like it better when I get used to it.