金属探测仪使用前，需要调整探测杆的长度，只要将黑胶通旋松，推拉胶通套管至适宜的长度，再旋转胶内通管，使电缆线绕紧，并使手柄尖端朝上，最后将黑胶通旋紧，锁住胶通套管。这样，手握探测仪手柄时，大拇指正好紧挨灵敏度调节电位仪。
Before the metal detector is used, the length of the probe rod needs to be adjusted. As long as the black glue is loosened, the rubber sleeve is pushed and pulled to the appropriate length, and then the rubber inner tube is rotated to tighten the cable and make the tip of the handle upward. Finally, the black glue is tightened and the rubber sleeve is locked. In this way, when holding the handle of the detector, the thumb is right next to the sensitivity-regulated potentiometer.