Compound Gauge, Oxygen Service Cleaned, 2-1/2 In., Basic Gauge Case Material Stainless Steel, Basic Gauge Wetted Parts Stainless Steel, 1/4 In., MNPT, Gauge Connection Location Bottom, -30 to 0 to 30, In. Hg/psi, +/-1.00 Percent, Gauge Panel Mountable No, Liquid Filled No, Gauge Primary Range Smallest Graduation 1/1, Gauge Case Material 304 Stainless Steel, Gauge Case Color Stainless Steel, Calibration Certificate Included No