Dial size: 1.5"(40mm),2.0"(50mm),2.5"(63mm),3.0“（75mm),4.0"(100mm)
Case: 304 stainless steel
Ring: 304  stainless steel crimpled ring or bayonet ring
Window: polycarbonate or tempered glass
Socket and connection: 316 stainless steel
Movement: stainless steel
Bourdon tube: 316 stainless steel

Connection: bottom entry

Pointer and dial: aluminum
Liquid : glycerin or silicon
Range: vacuum, compound,
Accuracy:Kl2.5 for 1.5",2.0", Kl 1.6 for 2.5",3.0",4.0"
Operating temperature:
Ambient: -20c-60c
Media: +60 c