A detector is good to see for example where there are wires or joists in a wall. You get great flexibility since it runs on a battery and lacks a cord that can restrict your movements.
From ManoMano
S2 Stud Detector Detects Wood Metal ac Wires with Marking Hole INT077588 - Stanley
This product is also available at 4 unverified merchants.
Too expensive? Get a notification as soon as the price drops.