The Oppama PET-4000 Pulse is a ignition checker and KV Tester. This tester checks for spark and has a fine adjustment to test for spark at the correct firing voltages. Each 1mm graduation on the adjustable gap represents approximately 2,000 volts in firing voltage. Allows check for spark between 2KV and 25KV easily. Also allows spark check while running or not running. This tool also aids in diagnosing the difficult to detect "wont fire when hot" and other coil related problems that ordinary spark testers just can't manage.