The 550 series gas piston pressure gauge includes five models: 551, 552, 554, 556, and 558, which are classified into two levels of uncertainty: A level and standard level. The A-level uncertainty is 0.006% of the reading; The standard level uncertainty is 0.015% reading, covering a range of -0.1 to 12MPa.

The 550 series gas piston pressure gauge is a gas calibration standard device specially designed for pressure standard laboratories, suitable for establishing first-class pressure standards. It can be widely used in standard laboratories, scientific research units, and industrial and mining enterprises for daily pressure instrument calibration and value transmission.