Harbor Freight item 04424 in-line ignition spark checker for gasoline engines. Features: - Connects between the spark plug and spark plug wire - Helps diagnose ignition or fuel delivery problems - Replaceable indicator bulb - Instructions printed on the back of the package New and unused in the original sealed blister package. Packaging shows shelf wear, scratches, and age-related discoloration as pictured. Questions welcome - happy to answer before you buy!
