1、Function: Fuel injector signal detection/intelligent circuit breaker/frequency/duty cycle/DC voltage/AC voltage/resistance/diode/intelligent testing. 2、Intelligent Testing: No need to select the mode after switching on, it can quickly detect the voltage, resistance and diode in the wiring of vehicle electrical system. 3、Frequency and duty cycle measurement: TopDiag P150 can measure the frequency and duty cycle in a circuit, helping users analyze the working status of the circuit and accurately determine the cause of faults. 4、Circuit Breaker: The circuit breaker has a short-circuit protection function, if overloaded, the internal circuit breaker automatically trips, always protecting the use of safety. 5、Supports multiple languages: English, Spanish, German, French, Italian, Portuguese, Polish, Japanese, Korean and other languages. Supports detection of all 12-24V vehicle electrical systems.