The bulb is gas filled. It can take up to 80,000 volts. You may connect to a 12 volt battery. You are unable to check continuity because the light is gas.
Lisle Inline Spark Tester - Visual Check, Double-Ended, Model# 20610

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- Gives a visual check of the ignition system
- Quickly diagnose problems with all ignition systems
- Connect the tool between the spark plug and the plug wire
- With the engine running, the tool flashes a mirror image of ignition spark
- Tool is double-ended to offer a straight boot and a 90° boot on one tool
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