Auto test tool for quick spark checks across cars, motorcycles, boats, chainsaws, lawn mowers and other gas engines with spark ignition. Saves time and reduces guesswork when diagnosing ignition problems. Made of high-grade material for durability. Pen-style car spark plug tester for easy handling and access in tight spaces. Car spark plug tester pen: when engine won’t start, use to determine if there is spark. Auto spark tester: turn the engine over; if ignition is being sent to the cylinder, the tester light glows. Benefits: simple to use, fast results, portable, compatible with multiple vehicle types, durable. Use scenarios 1) No-start diagnosis on a car to check for spark presence. 2) Quick spark checks on motorcycles, boats, chainsaws, or lawn mowers during maintenance or field service. 3) Pre-repair ignition verification in a shop or on-site before replacing parts.