OTC 3980 750 Series Professional Automotive Multimeter - The 750 Series AUTOMOTIVE MULTIMETER includes powerful automotive test functions such as; Frequency, Duty Cycle, Diode & Continuity Tests, PLUS Automotive specific tests; True RMS, RPM, Dwell, Pulse Width, Temperature, Backlight, RS232, and Min/Max. It is CATIII so it is compatible Hybrid vehicle systems.