Equus Dual-Beam Timing light / Stroboscope Equus 3122 Dual-Beam Timing light Operates to 12,000 RPM Coaxial Spotlight Double Check Indicator Detachable Test Leads Features: Test and adjust ignition timing on all 12V-Volt gasoline engines Inductive pick-up for easy hook-up even with engine running Pre focused coaxial spotlight provides handy illumination High-Intensity pre focused Blue-White beam Double-check indicate tests for incorrect hook-up or faulty bulb Detachable test leads and replaceable Xenon flash bulb Complete Instructions included