Adjustable knob measures centrifugal, vacuum, and computer advance. On/Off touch control. All metal inductive pickup. Reflected, super bright xenon flash. Removable leads with positive twist lock connector Professional advance timing light allows accurate adjustment of base and advance timing readings.  Features durable, plated ABS housing with over-molding grips, heat resistant over-molding on clips.  Blow molded case included.  Weight: 1 lbs.