Pressure Gauge Agricultural Ammonia 2-1/2 In. 0 to 400 psi Connection Size 1/4 in NPT Connection Location Lower Smallest Graduation 10 psi Accuracy +/-3-2-3 Percent Case Material Stainless Steel Case Color Silver Socket Material Stainless Steel Tube Material Stainless Steel Lens Material Glass Ring Material Screw-fixed Stainless Steel Operating Temp Range -40 Degrees to 150 Degrees F