Spark Plug Tester — Heavy-Duty Handheld Diagnostic Tool What it does and why you need it Quickly identifies inconsistent sparks and ignition timing issues that cause engine stumbling, misfires, or power loss. Lets you test whether a spark plug is producing a reliable spark before replacing parts or spending time on further diagnostics. Saves time and money by confirming if the problem is in the ignition system (spark plug, contact points, wires) rather than other engine components. Key benefits Accurate visual test: See the spark across the plug gap to determine whether timing or spark consistency is the issue. Heavy-duty construction: Built from quality materials to withstand repeated use during diagnostics and repair work. Easy to use and portable: Small, handheld design for fast on-vehicle checks and shop bench testing. Features and specifications Function: Visual spark plug tester that connects to spark plug connections to reveal spark strength and consistency. Compatibility: Designed to work with standard spark plug connections and typical ignition systems used on internal combustion engines. Size and form factor: Compact, handheld unit for convenient carrying and testing in tight engine compartments. Materials and durability: Constructed using robust materials to provide dependable operation during routine diagnostic use. Performance: Diagnoses spark failures, weak or inconsistent sparks, faulty contact points, bad ignition wires, and related ignition faults. How it works Connect the tester to the spark plug or ignition lead. Crank or run the engine as needed. Observe the spark across the tester’s gap to assess spark presence, strength, and timing consistency. Practical use scenarios Automotive: Check whether a misfiring car engine is caused by a weak or intermittent spark before replacing spark plugs or coils. Small engines and powersports: Diagnose ignition problems on motorcycles, lawn mowers, generators, or other small engines where engine stalling or loss of power is suspected. Workshop troubleshooting: Rapidly verify spark plug condition and ignition wiring during routine maintenance, saving time on further component testing. What it helps you confirm Whether a spark plug is firing reliably. If ignition timing or spark consistency is causing engine performance issues. Whether related components such as contact points or ignition wires require attention. Reliable and straightforward A practical diagnostic tool for mechanics, DIY enthusiasts, and service technicians who need a clear, visual way to check ignition performance without complex equipment.