General Instruments vacuum gauge Model SPGS-P is designed for reliable panel-mounted vacuum indication in demanding industrial service. The gauge uses a 2.5" / 63 mm dial with a 1/4" Male NPT back connection and front flange for panel mounting. Stainless Steel Made, with SS316 wetted parts, glass window and a dry case prepared for filling where vibration or dynamic pressure conditions require liquid filling. Measuring range is -760...0 mmHg with secondary bar scale, accuracy class is Class 1.6, and the compact design is suitable for suction lines, vacuum pumps, compressor systems and general process duties.