product specifications:1. type: pressure gauge, vacuum pressure gauge, compound pressure gauge. 2. case material: black painted steel, stainless steel & plastic. 3. connection type: . a type (bottom) . ad type (center back) . ud type (u clamp) . bd type (center back with flange) . is only for 2" and 2.5" 4. dial dia.: 1.5", 2", 2.5", 3.5", 4.5" 5. connection size: 1/8"pt, 1/4"pt, 1/8"npt, 1/4"npt. 6. ring style: . snap-in lens w/o friction ring . snap-in lens with friction ring 7. scale range: . 30'hg, 76cmhg, -100kpa, 30'hg-760mmhg . 30'hg-1, 760mmhg-1kg/cm2, 30'hg-15psi, . 30'hg-30psi, 30'hg-60psi, 30'hg-100psi, . 30'hg-160psi, 30'hg-300psi 8. different from the traditional bourdon tube or gears. 9. diaphragm gauges-simple structure and accuracy, meets ansi standard b40. 1-1974 grade b requirement which error does not exceed 2% of span at any point between 25% and 75% of span. 10. for industrial machines for pump ideal for: various industrial pressure gauges i.e. frozen gauge, gas gauge, water pressure gauge, vacuum gauges, compound gauges and compression tester, etc, it also ideal for any tire pressure gauges and ball pressure gauges.
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