Professional Digital Timing Light (DIS) Four function digital readout and easy-to-read backlit LCD:. Tachometer: 249 to 9,990 RPM. Advance Degrees (2 and 4 cycle): 0° to 90°. Dwell: 0° to 180° / 2-12 cylinders. Voltage: 10 to 16 volts DC. Switches from 2-cycle to 4-cycle. Heavy-duty ABS/Polycarbonate shockproof housing, molded boots, built-in hand guard for protection. Detachable 6-foot leads with metal inductive pickup. Patented Skip Circuitry Test up to 9,990 RPM. One-hand Operation. Includes molded plastic storage case 5568 Yes -