Compact ignition test pen and inline spark plug tester for small engines and automobiles. - Portable design with a pocket clip for easy carrying and storage, adding everyday convenience. - Inline spark plug tester: compact tester for small engines, enabling quick checks of ignition performance. - Automobile ignition test pen: stable characteristics, professional performance, high reliability, long service life. - Ignition spark indicator: tests spark plugs, spark plug wires, and coils without puncturing the wire, helping diagnose ignition issues without disassembly. Use scenarios - Lawn care and small equipment: quickly verify spark plug and ignition coil on a lawn mower or snow blower to decide if maintenance is needed. - Motorcycle or portable engine repair: check ignition system components without removing wires or parts. - Car diagnostics: assess spark plugs, wires, and coils in a car to locate ignition problems without puncturing or disassembling wires. This tool provides practical, reliable ignition testing with a compact form factor suitable for everyday use.