Have you received a liquid filled pressure gauge that reads off zero with no pressure applied? Don't worry. There is an easy way to fix this problem.
Liquid filled gauges are tested for accuracy at our laboratory. However, during transport, changes in temperature and altitude may cause a shift in the gauge's internal pressure. That, in turn, causes the gauge's resting point to change.
On top of the gauge there is a rubber stopper which secures the liquid filling. Just lift on edge of the stopper to equalize the pressure inside the gauge to atmosphere. Try to position the gauge so that the air bubble inside the gauge is at the opening.
If this simple fix does not return your gauge to a zero reading with no pressure applied, of course you can ship or deliver it to Huston-DePue Calibration Laboratories for further evaluation and calibration.