how to choose according to use environment and the nature of the measured medium pressure gauge: 1) In atmospheric corrosion resistance is stronger and more dust and spray liquid conditions, appropriate chooses closed all plastic pressure gauge. 2) Dilute nitric acid, acetic acid, ammonia and other general corrosive medium, should choose acid, ammonia pressure gauge or stainless steel diaphragm pressure gauge pressure gauges. 3) Dilute hydrochloric acid, hydrochloric acid gas, heavy oil and its similar with the corrosive, containing solid particles, such as viscous fluid medium, should choose the diaphragm pressure gauge or diaphragm pressure gauge. The material of the diaphragm and diaphragm, must choose according to the character of the measured medium. 4) Crystallization, scarring, and high viscosity medium, should choose diaphragm pressure gauge. 5) In the case of strong mechanical vibration, should choose seismic pressure gauge or Marine pressure gauge. 6) On the occasion of inflammable, explosive, if you need electric contact signal, should choose explosion-proof electric contact pressure gauge. 7) Medium should choose special pressure gauge measuring the following: (1) gas ammonia, liquid ammonia, ammonia pressure gauge, vacuum gauge, pressure vacuum gauge; (2) the chlorine: resistance to chlorine pressure gauge, pressure vacuum gauge; (3) acetylene: acetylene gauges; (4) hydrogen sulfide, sulfur resistance pressure gauge; (5) the lye: alkali resistance pressure gauge, pressure vacuum gauge. 6 oxygen, oxygen pressure gauge; All landowners hydrogen: hydrogen pressure gauge;