In-Line Ignition Spark Checker

Flash can be seen in bright sunlight. Clear plastic body can withstand rough use and resists automotive chemicals. Protected by mechanical strain relief.

• Connects in-line between the spark plug and the ignition wire
• Use to quickly troubleshoot ignition system with "hands-free" operation
• Shows a duplicate view of the ignition spark
• Technician can visually check condition of ignition system at each cylinder
• Frequency and intensity of flash indicates whether there is an ignition system problem or a fault in the fuel delivery system

Replacement Bulb Part No. 23904.