This set of four HT Lead Testers allows you to quickly check for ignition problems in-line to the spark plugs which could result in misfires or non-running. Easy to use, just install the testers between the spark plugs and HT leads and then run engine.

For testing the output on HT leads.
For tracking ignition problems.
RoHS compliant.
Unsuitable for engines with deep recessed plugs.