4.freon pressure gauge
Diameter:4",3",2 3/4",2 1/2"
Case:plastic, steel,stainless steel
Window:polycarbonate
Movement:brass
Connection:bottom ,back
Connection:7/16"sae bsp,npt,pt,1/8"
Accuracy:3"--4" 1.5-1.0% 1 1/2"-2 3/4":2.5--1.6%