Pneumatic Temperature Indicator, Air Connection Type 1/8 in NPT, Indicator Accuracy +/-3-2-3 Percent of Full Range, Maximum Ambient Temperature 150 Degrees F, Maximum Control Temperature 100 Degrees F, Maximum Operating Pressure 15 psi, Minimum Ambient Temperature -20 Degrees F, Minimum Control Temperature 0 Degrees F, Minimum Operating Pressure 3 psi, Overall Diameter 2 1/2 in, Product Type Pneumatic Temperature Indicator