Step 1: Open the meter cover and be careful not to damage the two wires on the circuit board that are connected to the power switch. Find the three calibration regulators at the bottom right of the circuit board; keep the meter under this environmental condition for at least 1/2 hour, and then start the test after obtaining self-balance.

Step 2: Connect one end of the cable to the alligator clip and the other end to the banana plug. Connect both ends of the resistor with alligator clips. There are three calibration regulators, the upper one is "humidity" measurement, the middle one is "impedance", and the lower one is "temperature adjustment with a small screwdriver". Clockwise direction is the increase value Adjust, the counterclockwise direction is the lower value adjustment.

Step 3: Press the power switch and compare the values of "temperature", "humidity" and "resistance" at the same time. Press the power switch resistance again, how to calibrate the insulation resistance tester and observe the LCD display. Close the watch cover and tighten the four fixing screws. Press the power switch to confirm whether the watch is working properly.