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 6-pin electric valve detection 5-pin electric valve detection Electric valve stuck valve repair Home air-conditioning electronic expansion valve drive detection Single/double damper detection Damper heating wire power supply Three-wire fan detection Four-wire fan detection Host size: 16 x 11 x 5cm/6.3 x 4.3 x 2inch (LxWxH) Overall length with stretched wire: 1.45m/4.8ft Color: As shown Material: plastic Package Contents: 1 * Refrigerator Testing 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.