The plug engine ignition tester is an all in one tool for diagnosing ignition systems and testing spark plugs. Its compact pen style design fits easily in a pocket. The tester combines a built in spark plug gap gauge and an inline spark tester, helping you verify the ignition path from coil to plug and measure plug gaps for reliable performance. Key benefits: All in one diagnostics: test ignition components and perform basic repairs without specialized tools Built in spark plug gap gauge: quickly check gap and adjust to recommended spec for firing Inline spark tester: confirms electrical signal from coil to plug and highlights coil, wire, or plug faults Broad compatibility: works with most standard automotive ignition systems across a range of vehicles Portable and durable: compact, lightweight, and designed for regular use in garage or field settings Use scenarios: Home maintenance: diagnose misfires or hard starts by testing spark path and coil signals Professional : perform quick ignition checks during tune ups or after component replacement Field diagnostics: carry for on the road testing on unfamiliar vehicles to identify ignition issues fast