Check the listing for details. GRAINGER APPROVED 4FMF9 Compound Gauge,Test,3-1/2 In 4FMF9. Condition: New. Listed at 19.19 USD. Commercial Compound Gauge, Nominal Dial Size 3 1/2 in, Accuracy +/-3-2-3 Percent, Gauge Case Material ABS Plastic, Process Connection Type NPT, Process Connection Gender Male, Lens Material Acrylic, Process Connection Size 1/4 in, Field Fillable No, Process Connection Location Center Back, Case Color Black, IP/NEMA Rating Not Rated, Primary Pressure Range 30 to 0 to 30, Dry Dampening Feature None, Vibration Resistance None, Dial Color White Standard Gauges with ABS Housing• Accuracy: +/-3-2-3% Acrylic lens Connection/internal material: brass/bronze Ambient operating temp.: -40 Degrees to 150 Degrees FUse with air and noncorrosive fluids such as water and oil in pumps, filters, compressors, and regulators. Glycerin-filled gauges have reduced pulsation and pointer vibration.