General description The TopDiag P55 Car Electric Circuit Tester is an advanced automotive diagnostic tool designed for efficient testing and troubleshooting of vehicle electrical systems. It features intelligent voltage and resistance identification, a multimeter mode, and an oscilloscope function, making it a versatile tool for both professionals and DIY enthusiasts. Technical specifications Operating temperature: 0℃-60℃ (32-140℉) Storage temperature: -40℃-70℃ (-40-185℉) External power supply: 12V or 24V battery powered Minimum operating voltage: 9V Maximum operating voltage: 30V Maximum measuring voltage: 100V Minimum measuring voltage: 0.1V Resistance measuring range: 1 ohm-200K ohm Active current measuring range: 0-18A Maximum continuous current: 18A Display: 2.4 inch true color TFT screen (320*240 DPI) Color: Black Material: Plastic Installation Connect the RED clamp to the positive pole of the battery. Connect the BLACK clamp to the negative pole of the battery. The probe will