Check the listing for details. Tool Aid 23975 Bulb for In-Line Ignition Spark Checker (23970). Condition: New. Listed at 14.19 USD. Tool Aid 23975 Bulb for In-Line Ignition Spark Checker (23970) The Tool Aid 23975 is a replacement bulb specifically designed for the Tool Aid in-line ignition spark checker (likely model 23970). This small but crucial component plays a vital role in visually verifying spark presence during ignition system troubleshooting. Features: This bulb functions as a direct replacement for the original bulb that came with your Tool Aid 23970 in-line ignition spark checker. When a spark is detected from the spark plug during testing, the bulb illuminates and flashes, providing a clear visual cue. A functioning bulb is essential for proper operation of your spark checker and accurate interpretation of spark presence or absence. Specifications: Order Part Number: SG23975 Item Description: Bulb for in-Line Ignition Spark Checker Manufacturer: Tool Aid Country of Origin: TW Harmonization Code: 85392925 Default Selling Unit: EA