Dial Probe Thermometer Closed Circuit Liquid Level Gage Mounting Centers (In.) 12 in 1/2-20 UNF Mounting Thread Front Mounting Max Operating PSI 125 psi Max Operating Temp (F) 250 Degrees F Dial Range 0 to 300 Dial Material Stainless Steel Dia 1 3/8 in Borosilicate Sight Glass Aluminum