<p>A wide range of compatible applications</p> <p>Simple operation at a glance, one key single on \/ off backlight \/ sleep</p> <p>Intelligent detection prompt</p> <p>ABS flame retardant environmental protection material, high temperature resistance</p> <p>Master it at any time and anywhere, light weight \/ small size \/ built-in lithium battery \/ portable belt</p> <p>It integrates a variety of powerful functions and functions</p> <p>Professional precision LCD industrial appearance, simple operation, backlight function and long energy storage</p> <p>HTN wide viewing angle LCD green backlight</p> <p>Large capacity and easy charging</p> <p>3.7v\/1000mah standby lithium battery type-C charging interface</p> <p>A wide range of compatible applications</p> <p>Measuring 18650 lithium battery</p> <p>Voltage and internal resistance of AA \/ AAA alkaline battery</p> <p>And displayed by LCD</p> <p>Size: 156 x 63 x 36mm</p> <p>Calibration method:</p> <p>After dismantling the back panel, remove the marked ones first.</p> <p>Gently push up from the front LCD position, and then reversely remove the red wire on the back, so that it can be removed</p> <p>Then find a way to add a standard voltage of 5V between V+ V-.</p> <p>Press the button again to turn on the product to see if the voltage can be displayed normally</p> <p>Then just remove the battery</p> <p>Short-circuit the two points on this side, then plug in the battery, and the meter will automatically calibrate.</p> <p>After the calibration is successful, you can install it back as normal.</p> <p>Colour: black</p> <p>Material: plastic</p> <p>Package Contents:</p> <p>1 x digital display tester (Due to different batches, the appearance of the product may be different, but the function is the same)</p> <p>Only the above package content, other products are not included.</p> <p>Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +\/- 1-3cm.</p>