Inverter Refrigerator Tester Variable Frequency Board Testing Instrument Solenoid Valve Repair Tool with Buzzer Warning for Detection CN Plug Item Type: Inverter Refrigerator Tester Material: ABS Operating System: for Win Function: Frequency Adjustable, Voltage Display, Current Display, Frequency Conversion Compr Inspection, Single Line Frequency Board Testing, Pulse Solenoid Valve Detection, Main Board Output Detection of Electromagnetic Valve, Constant Frequency Compr Power Supply Observation Current, Double Line Frequency Board Testing, 6 Pin Electric Valve Testing, 5 Pin Electric Valve Testing, Solenoid Valve Stuck Valve Repair, Household AC Electronic Expansion Valve Drive Testing, Single and Double Wind Door Testing, Wind Door Heating Wire Power Supply, 3 Wire Fan Testing, 4 Wire Fan Testing