A 6? Differential Pressure Indicator Widely Used In Jet Engine And Missile Testing Programs, Aircraft Ground Support Equipment, Water Treatment Processes, And Air Conditioning Systems. Commonly Used And Recommended For Liquid Level Indication Of Materials Such As Lox, Helium, Hydrogen, Nitrogen, Co2, And Argon.Housings And Safe Working Pressures:Forged Brass, Swp 1500 Psi.(100) Barbrass, Swp 1000 Psi.(68.9 Bar)Cr Steel , SwpS 1500, 3000, & 6000 Psi.(103.4 , 206.9, &413.8 Bar)316 Stainless Steel, SwpS 500 ,1500,3000,6000 Psi. (34.5, 104, 207, 414 Bar)Cast Aluminum, Swp 400 Psi.(27.6 Bar)Alloy Steel , Swp 10000 Psi.(690 Bar)Bellows Material:316 Stainless Steel, Beryllium Copper, Or Inconel Dp Ranges:0 To 25 Psi Temperature Limits:-40 F (-40 C) To + 180 F (+80 C) In .Dimensions : 20x20x11 cms.