Ashcroft 1009 Pressure Gauges, Stainless Steel, 6" Diameter, 1/2" connection - Patented PowerFlexTM movement isolates movement from shock and vibration for longer life - All stainless, all-welded construction for long life - ASME Grade 1A, 1% accuracy full scale - True ZeroTMpointer indication - no stop pin to mask false zero reading - ensures safety and process control