Adjustable frequency Voltage display Current display Inverter compressor testing Single-wire frequency conversion board detection Pulse solenoid valve detection The main board detects the output of solenoid valve Current observation of fixed frequency compressor power supply Two-wire frequency conversion board detection Electric valve stuck valve repair Home air-conditioning electronic expansion valve drive detection Single/double damper detection Damper heating wire power display Three-wire fan detection Four-wire fan detection The main board to inverter board output signal detection 2K/5K/10K temperature probe detection Compressor short circuit buzzer alarm, Other compressor fault buzzer alarm Air-conditioner three wire fan frequency conversion motor drive Range hood by three wire variable frequency motor The compressor cylinder clamping instrument will make three attempts to , and if it fails to , the buzzer will give an alarm. Colour:blue Material:plastic type:110V Package Contents: 1 x Multifunctional Inverter Refrigerator Detector Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.