Heavy-duty spark plug tester — compact, reliable tool for fast ignition diagnostics Key benefits Quickly determine whether a spark plug is firing or if the ignition system is the source of a problem — saves time and money by confirming whether the issue is in the spark plug or elsewhere. Visual, hands-on diagnosis of spark presence, intermittent sparks, and timing inconsistencies so you can identify misfires, weak sparks, defective contact points, or poor wiring. Rugged construction and high-quality materials provide durable, repeatable performance for workshop and field use. Features and attributes Function: Connects to spark plug connections to show spark across the electrode gap; lets you see spark presence and consistency while cranking the engine. Build: Heavy-duty construction made from high-quality materials for long service life. Size: Handy, compact design that is easy to carry and use at the bench or on the vehicle. Performance: Detects spark/no-spark conditions, intermittent spark events (timing inconsistencies), defective contact points, and poor cable/wire connections. How it solves problems Confirms whether a misfire is caused by a bad spark plug, a weak or intermittent spark, or faulty wiring/contacts so you can focus troubleshooting and avoid unnecessary parts replacements. Visual feedback makes it straightforward to compare spark strength and timing between cylinders. Typical use scenarios Automotive: Quickly check spark plug operation and ignition consistency during engine diagnostics on cars and light trucks. Motorcycles and ATVs: Compact tester fits workshop or field toolkits for routine troubleshooting of small-displacement engines. Small engines: Diagnose spark problems on lawn mowers, generators, and other garden equipment before replacing parts. Quick operation tip Attach to the spark plug connection, crank the engine, and observe the spark across the electrode gap to assess strength and consistency. This compact, heavy-duty spark plug tester is a straightforward diagnostic tool for anyone who needs a fast, reliable way to confirm spark plug and ignition system performance.