Pressure Test Pump LPP40, operated with ambient air to generate pressure up to +40 bar (580 psi), switchable to generate vacuum up to -0,95 bar (-28 inHg) The Pressure Test Pump is used to generate LPP40 pressures and vacuum for checking, adjusting and calibrating mechanical and electronic pressure measuring instruments by comparative measurements. These pressure tests may be carried out in laboratories, workshop or on site at the measuring point. If the instrument under test and a sufficiently accurate reference measuring instrument are connected to the Pressure Test Pump, the same pressure / vacuum is applied to the LPP40 two instruments when the pump is operated.