ALLOSUN EM135 Automotive Digital Multimeter Main display owns 5-digit LCD, with a Max. Reading of 99999 It owns AC and DC voltage, AC and DC current, resistance, diode, continuity, capacitance, frequency, duty cycle, and Celsius/Fahrenheit temperature measurement functions It can be used to measure RPM, Dwell angle, fuel injection duration, o2-sensor, alternator and for fault Code detection Portable size but come with great and multi-function