This Timing Light Is A Ideal Way To Set Engine Times And Also Check Mechanical Or Vacuum Advances. It is Automatic Reverse Polarity And Overload Protection. Its Trigger Activated and Clamp-On Inductive Pickup. Its Material is 180g/M2 Polyester Fabric. It is Durable Construction and Accurate At All Speeds. Its Clip Cable Length 4FT and Induction Clip Cable Length3FT. Its Maximum Speed is 8000 R/Min