# Recalibrating the Measuring Tool

If a metal object is indicated and the measuring indicator (b) indicates a continuously high amplitude, even though there is no metal object near the measuring tool, the measuring tool can be manually recalibrated.

- Ensure that the battery charge indicator (d) still shows a capacity of at least 1/3.
- Switch the measuring tool off.
- Remove all objects near the measuring tool that could be detected (including watches or metal rings).
  Hold the measuring tool up horizontally so that the rear side of the measuring tool is pointing towards the floor.
- To switch to calibration mode, simultaneously press the on/off button (7) and the audio signal button (6). Press and hold both buttons (for approx. 5–10 s) until the light-up ring (1) flashes red.
- To start recalibration, press and hold the audio signal button (6) (for approx. 5−10 s) until the light-up ring (1) lights up red.
- If the calibration was successful, the measuring tool will start automatically after a few seconds and will be ready for operation again.

Note: If the measuring tool does not start automatically, repeat the recalibration. If the measuring tool does not start, send it to an authorised Bosch after-sales service centre.