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 a rugged overmolded enclosure and contains high-quality, tangle-free test leads, temp probe, RPM clamp and carry case. This multimeter is CAT III 1000V 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 diagnois.