1.s.s case / brass internal 2.glycerine filled 3.63mm 4.accuracy +_1.5%,+_2.5% 5.s. ... s case / brass internal fluid filled Prerssure gaugeDial size:1.5",2.0",2.5",3 ... , mpa, bar, kg/cm2) availableAccuracy:1.5%,2.5%Liquid filled media:glycerine or silicone