After a short automatic test, the probe can be performed.The detector automatically enters the metal detection function mode.At this time, if there is no metal interference on the display, it means calibration is required.The calibration method is to place the probe in an environment that does not interfere with metal and ferromagnetic fields (e.g., lifting the device in the air), the display signal is zero, after pressing the metal detection button until the blue signal is on, the calibration is complete, and release the button can start metal detecting action.