D7959 Pressure Gauge Test 4-1/2 In. 0 to 200 psi Connection Size 1/2 in NPT Connection Location Lower Smallest Graduation 2 psi Graduations 20 psi Accuracy +/-0.5 Percent Case Material Stainless Steel Case Color Silver Socket Material 316 Stainless Steel Tube Material 316 Stainless Steel Lens Material Glass Ring Material Twist On Stainless Steel Operating Temp Range -40 Degrees to 275 Degrees F Calibration Certificate NIST with Data Series 4207 Includes Pulsation Restrictor