... Description glass thermometerRange:-50~+600 celsius degreeSize: 2-1/2", 3", 4", 5", 6", Stem diameter: normal 6.3mm or according to ... /8", 1/2", NPT ,BSPT, BSP or according to customers orderLens: V shaped aluminum or ABS scale with black figures, lens front ... , red or blue reading mercury or kerosene filled tube.Accuracy: 2 ...