Bimetal Thermometer: high accuracy; bimetal coil is imported from US; Bimetal Thermometer:standard:ASME B40.200-2008size: 2.5"(cunstomer request available);Lens: arched glass;Stem: 6.35mm, 8mm, 12.7mm,Stem length: from 1" to 36",Range: 20~240F/C;Accuracy: +/-1.5%,waterproof: IP65,Connection: 3.8"NPT;Install: Back connection,material for stem and thread: Brass,SS304, SS316,