The OTC 550 Series Digital Multimeter, No. 3940, features powerful automotive test functions such as frequency, duty cycle, diode and continuity test. This multimeter offers an overmolded enclosure and contains high-quality, tangle-free test leads, temp probe, RPM clamp and carry case. This multimeter is CAT III 1,000V and hybrid compatible to safely diagnose high-voltage circuits found in hybrid vehicles. PC software and cable included so users can use their computer as a data logger and display detailed diagnosis.