This flex-drive compression tester features an air-hold valve and a gauge reset button. Tests up to 300 PSI.
- Checks cylinder compression from 0 PSI to 300 PSI (0 to 21kg/cm2).
- Fits 14mm & 18mm spark plug threads.
- Equipped with air-hold valve and gauge reset button.
- 11″ flexible rubber hose.
- Complete instructions included.
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