AUTOOL DM303 Multifunction Measurement and Testing Device - New Version! 🔹 12 Important Functions in One Device 🔹 1 Battery Electrical Measurement (Voltage) 2 Electrical Draw Measurement (Amperage) 3 Electrical Conductivity Measurement (Resistance) 4 Oscilloscope Electrical Signal Testing 5 Wiring and Cable Inspection (Electrical Circuits) 6 Battery Condition Test 7 Fuel Injector Test 8 Relay Test 9 Simple Electrical Signal Test 10 Coil Test 11 Read Car Computer Data 12 Electrical Signal Speed Measurement (Frequency)