Measures engine speed, often using an inductive pickup that clamps around a spark plug wire.
Always work in a well-ventilated area to avoid carbon monoxide buildup. Ensure the vehicle is in Park (automatic) or Neutral (manual) with the parking brake engaged. equus 3022 tester manual full
Measures the period that the contact points remain closed in a classic ignition system. Measures engine speed, often using an inductive pickup