Dial size:2.5"(63mm),4.0"(100mm),6.0"（160mm)
Case: 304 stainless steel
Ring: 304 stainless steel bayonet ring 
Window: tempered glass or safetly glass
Socket&connection: brass
Movement: brass
Pointer and dial: alumium
Bourdon tube: brass
Liquid: silicon or glycerin

Connection entry: bottom , back and low back for 100mm
Range: vacuum ,compound 0-10000psi
Accuracy: kl1.6 for 2.5",kl1.0 for 4.0",6.0"
Operating temperature:
Ambient: -20c-60c
Media: 60 c