PROBE PGI PISTOL POWER INJECTORFeatures and Benefits: - Pistol probe professional series - Quick check tools for the serious automotive professional - There"s nothing faster or more versatile to verify circuits and component operation for window and lock motors, fuel pumps, cooling fans, lights, horns, solenoids, relays, and most other power accessories - Indicates: 6/12/24 Volt - Thumb switch applies power or ground through the tip