The timing light enables the synchronization of the ignition system with the piston movement. An inductive pick-up replaces the necessity to disconnect the spark plug wire to operate the timing light. Timing readout: 0-60° BTDC Features: Timing advance up to 60 crankshaft degrees | Superior performance at all speeds through 8000 rpm | Operates on all 12volt ignition systems | Xenon bulb providing Brilliant Blue/White | 1,000,000 flash capacity | Automotive reverse polarity and overload protection | Inductive pick-up | Double check light indicates incorrect hook-up and faulty flash | Replaceable Xenon flash tube (Part No. 77009) | Full instructions included.