Dail 1.5"-4" Stainless steel case Brass internal Bottom or back connection Good quality Liquid Filled Gauge w/Bayonet RingFor anti-shock ... . Specifications are as follows:1) Dial size: 1.5", 2", 2.5", 3", 3.5", 4", 6"2) Connection size: 1/8", 1 ... ; in Hg, cmHg or mmHg)7) Accuracy: 3% - 2% - 3% , ?.5%Inner Packing:Paper box, special printing acceptedOuter Packing:Cartons, packed ...