OEMTOOLS 24366 Multi-Function Power/Ground Meter/Probe Activate Components By Applying Power or Ground with the Simple Rocker Switch. Components Can Be On or Off the Vehicle Measures DC Voltage Up to 48V DC Measures Frequency in HZ, Quick and Easy Injector Pulse Tester Along with Other Digital Sensors Inductive Measure Spark KV, Just Lay the Probe By the Plug Wire or Coil to Help Locate Misfires Peak Voltage Detection with Simple Tone