A compact, portable instrument incorporating all features of the RSC Dead Weight Gauges plus a self-contained pump for producing pressure. This tester can be used for checking spring gauges, calibrating bourdon gauges or other instruments, pressure testing small vessels, and measuring gas pressures with high accuracy. Adapters in sizes to fit usual gage connections, hand jack and hand set are supplied on the same base as the tester and weights. Bourdon tubes may be checked directly on the tester, or by tubing connectors if panel mounted. Carrying case with handle make the instrument easily portable and provides necessary protection.