The Profometer 4 (and its successor, the 5+) operates on the . It induces a magnetic field in the concrete; when a metallic object like a reinforcing bar is encountered, it creates an "echo" that the device measures to determine depth and position.
For grid scanning, mark a 10×10 cm grid on surface. proceq profometer 4 manual
Hold the search head in the air, away from any metal, and press the ZERO button. This accounts for environmental interference. The Profometer 4 (and its successor, the 5+) operates on the