About this itemTop-of-the line timing light with direct reading advance scale adjusts from 0-90 degreesWorks with most ignition systems: conventional, electronic and computer controlled systems - domestic and importDigital tachometer ranges from 249 to 9,990 RPM including Patented Skip Circuitry Test up to 9,990 RPMSplit-screen digital LCD readout displays tachometer and advance functionsSlim, rotating barrel for better aim at timing mark.