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 driven by three wire variable frequency motor The compressor cylinder clamping instrument make three attempts to start, and if it fails to start, the buzzer give an alarm. Colour:blue Material:plastic type:220V 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 picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.