Special Use Testers

When an engine is down on power, the fastest answers come from the simplest instruments. David’s Heavy Duty Tool Sales carries special use testers for heavy-duty diagnostics — cylinder leak down testers, compression testers, spark testers and the purpose-built instruments that tell you exactly where a cylinder’s health went.

Cylinder Leak Down Testers

A leak down tester pressurizes the cylinder and shows you where the air escapes — rings, valves or head gasket — turning a teardown decision into a five-minute test. We stock leak down testers with the adapters for heavy-duty diesel and gasoline applications.

Compression Testers & Adapters

Diesel compression numbers demand diesel-rated gear. Pair these testers with the compression test adapters in our engine tools line to cover specific platforms — including glow plug and injector-port adapters for engines that hide their access points.

Spark & Ignition Verification

For gas engines in the mixed fleet, spark testers confirm ignition output instantly. Combine with circuit testers and multimeters to isolate spark, fuel or wiring without swapping parts on hope.

Test First, Wrench Second

Veteran-owned and serving North American shops since 2016. Order online or call 616.591.0095 — we’ll match testers and adapters to the engines in your bays.