Instruct: Classify Amazon reviews into positive or negative sentiment
Query: get something else for the same money

Bought this model - didn't work. Reread the instructions 3 times and tried many different surfaces - would never calibrate - always just kept beepingBought the Zircon Studsensor Pro SL AC for the same price (within a buck or so) - worked right out of the package. I also liked that you could switch the Zircon from 3/4" to 1 1/2" depth. These units say they detect live AC electric lines - but you'd be a fool to trust it IMHO - make sure the circuit is dead.