Reply To: compression loss due to hose on gauge

[Mumbles]

The problem has more to do with where the check valve is located, not the size or length of the hose.

A poorly designed compression tester has the check valve near the gauge while it should be right at the fitting which screws into the motor. A better quality tester with the a long hose and check valve near the fitting will give an accurate reading but it will take a few more pulls than using a gauge with a shorter hose. A poor quality gauge with the check valve near the gauge will never give an accurate reading no matter what length of hose is being used as all the compressed volume of air in the hose is lost with each cycle. A smaller bore size has nothing to do with the readings except for taking more pulls to get the final reading as it has to bring all of the air in the hose up to pressure a little bit at a time