- Precision measurement: Provides accurate voltage readings for car spark plugs to support reliable ignition performance and help ensure the engine runs with strong power. - Portable and compact: Handy, lightweight design that is easy to carry for on-site testing of spark plugs, ignition coils, and related ignition components. - Easy to carry and use: Small, portable form factor allows testing spark plugs wherever you are; functions as an ignition cable tester and electric tester as needed. - Practical handheld design: Designed for easy handling and operation anywhere, enabling on-the-go testing of your car's spark plug voltage and ignition circuits. - Clear compatibility and purpose: Intended for testing car spark plugs, ignition coils, and associated ignition system circuits with a straightforward handheld tool. 2-3 practical use scenarios - Routine maintenance at home: Quickly verify spark plug voltage during scheduled tune-ups to confirm ignition performance and prevent misfires. - On-site road or shop testing: Diagnose rough idle or misfiring cylinders on-site without removing components, enabling faster repairs. - Field testing during tuning or service: Use during performance checks or diagnostics at a track, garage, or service station to validate ignition system health before and after maintenance.