Merit's 2.5" & 4" dial PSSA Series gauge has a 304 SS case and bayonet ring, 316 SS internals, 1.5% (2.5") and 1% (4") full scale accuracy, dished dial, PC lens, glycerin filling (also available without filling) and the 1/4"/1/2" NPT or BSPT socket is welded to the case for additional durability. The PSSA Series is available in single scale psi only or dual scales in psi/kPa or psi/Bar ranges from vacuum up to and including 10,000 psi. These gauges are suitable for any application that is suitable for 316 stainless steel and requires additional dampening of the pointer & movement due to pulsation or vibration.