SI make TP1 pressure test system complements an extensive range of pressure calibration products and can be used for calibration checks on pressure gauges, switches, indicators, recorders and controllers. The TP1 pressure test system is a portable hand operated unit suitable for generating pressure from -0.8bar (vacuum) to 25 bar. It is supplied in a light high quality carrying case with adapters, a set of washers and with a provision for additional instruments with a flexible hose.