The 5568 Pro Digital Timing Light is the professional choice for a high-quality timing light that will stand up to daily shop use. Made with a heavy-duty ABS shockproof housing and a molded rubber boot for extra protection against from moving parts in the engine bay. It features a bright backlit screen for easier viewing in hard-to-see places. The four-function digital readout includes tachometer, advance degrees, dwell, and DC voltage. This inductive xenon strobe timing light gun works with most ignition systems: DIS, conventional, electronic, and computer-controlled systems domestic and imports Powerful Capabilities: Check timing, diagnose a no-spark condition, check for ignition advance, and more. 4 Function Digital Readout Backlit LCD: Tachometer 249 to 9,990 RPM | Advance Degrees (2 4 cycle) 0�� to 90�� | Dwell (2-12 Cylinders) 0�� to 180�� | Voltage 10 to 16 Volts DC Heavy-duty ABS/Polycarbonate Shockproof Housing and Rubber Molded Boots: Superior strength and longevity in high-use environments. Detachable 6-foot Leads: User-replaceable and provide ample length even in the largest engine bays. Skip Circuitry Test: Tests up to 9,990 RPM and switches from 2-cycle to 4-cycle. Slim Rotating Barrel: Allows for easier and more accurate aiming at the timing mark. Built-in Hand Guard: Protection from moving parts in the engine bay.