Quick Start EN 4 Install the battery. Figure 48 Installing the Battery Note: Pay attention to the positive and negative pole of the battery when replacing the battery. 4.8 Safety lockhole A safety lockhole is reserved on the back shell of the instrument, and users need to purchase a safety lock by themselves. Wrap one end of the safety lock around an object that is difficult to move, insert the other end into the safety lock hole, turn the key Copyright©Qingdao Hantek Electronics Co.,LTD HT360 series user manual 21