How to Use the MRCARTOOL H90 Spark Plug Tester
Set up the H90 on a safe 12 V bench supply, fit one or two spark plugs, sweep its 500–9000 rpm simulation and interpret a controlled side-by-side test.
Tag Spark Plug Testing
Set up the H90 on a safe 12 V bench supply, fit one or two spark plugs, sweep its 500–9000 rpm simulation and interpret a controlled side-by-side test.