Inductive pick-up clamps over the spark plug wire - no adapters required. Precision focused flash tube for concentrated brilliant light. Removable / Replaceable leads. Field replaceable flash tube. Trigger switch prolongs tube and circuit lifeThis hard working timing light is accurate up to 8,000 RPM. An extremely bright flash will help you time the engine. The break and shock resistant plastic housing, reduces damage from accidental drops.This is designed for all 12 volt systems, reverse polarity protected.