On Head valve spring checker is affordable, and incorporates the very latest technology. It not only reads the force, down to 0.1 lbs, it can actually measure the valve seat pressure automatically. Unlike traditional Seat Pressure checkers, where the user tries to "feel" when the valve unseats or reseats, our checker does that through advanced computer algorithms. The result is a completely unbiased, repeatable number that is obtained no matter who is doing the measurement.

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