The dual-piston pressure gauge is mainly used for calibrating pressure sensors, pressure transmitters, digital pressure gauges and other precision pressure instruments. It can also be used to calibrate mercury pressure gauges, various non-corrosive industrial pressure gauges or other types of precision pressure measuring instruments. It is characterized by wide measuring range, large measuring range, sharing a set of weights, saving purchase cost, and widely used in industrial and mining enterprises such as petroleum, chemical industry, smelting, coal mine, ship, instrument and so on.