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A gas operated, gas lubricated piston-gauge to 3000 psi.

http://us.flukecal.com/products/pressure-calibration/piston-gauges/2470-gas-piston-gaugehigh-pressure?quicktabs_product_details=4

Keywords: Manual, Ruska, deadweight, deadweight tester, dead weight, dead weight tester, deadweight gauge, dead weight gauge, 2470, piston, piston gauge, pressure balance