Handheld Spark Plug Gap Tester — Compact, reliable tool to check ignition spark and diagnose misfires What it does Lets you visually inspect the spark across the spark plug gap to determine if ignition timing or spark delivery is inconsistent. Diagnoses spark failures, misfires, defective contact points, bad cables, poor connections and related ignition problems. Quick check to confirm whether a problem is in the ignition system before replacing parts. Key benefits Save time and money: fast on-vehicle checks prevent unnecessary part replacement and lengthy troubleshooting. Clear results: visible spark across the gap makes it easy to tell if a plug and ignition are firing correctly. Durable construction: built from high-quality, heavy-duty materials to withstand routine shop and field use. Easy to use: compact, handheld size fits easily in a toolbox and is simple to connect to spark plug leads. Features and compatibility Function: visual spark tester for spark plug connections; detects spark presence, weak spark and intermittent firing. Compatibility: works with standard spark plug leads on cars, motorcycles, small engines and other gasoline-powered equipment. Size: small, hand-held design for portability and quick access to spark plugs in tight engine bays. Material and build: robust construction and quality materials for reliable use during repeated diagnostics. Performance: provides a clear indication of spark behavior under crank or running conditions so you can pinpoint ignition-related issues. Typical use scenarios Automotive troubleshooting: quickly check whether a cylinder misfire is caused by a no-spark or weak-spark condition before replacing coils, plugs or wiring. Motorcycle and ATV maintenance: portable tester for on-the-road or garage checks of ignition performance after tune-ups or repairs. Small engine service: inspect spark and ignition on lawn mowers, generators, outboard engines and other equipment to confirm whether ignition is the root cause of power loss or stalling. How to use (basic) Disconnect the spark plug boot and connect the tester to the spark plug lead or plug. Crank the engine or run it as required. Observe the spark across the tester gap: a steady, strong spark indicates good ignition; weak, intermittent or no spark indicates a problem with the ignition component or wiring. What you get A compact spark plug gap tester designed to diagnose ignition spark issues reliably, built with durable materials for professional and DIY use. Note: Intended for visual ignition diagnostics only. Follow all safety precautions when working around running engines and high-voltage ignition systems.