It is composed by a general plastic case pressure gauge and a plastic diaphragm isolated
connection body. The codes of the connection body are F standard type and F1 type (Diaphragm body and type introductions to see page H.01). The main parts are made all by plastic and the isolation diaphragm is made from PTFE corrosion-proof. It would be used in measuring the corrosive liquid and gas as chlorine, hydrochloric acid and nitric acid, etc.