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The Floating Ball type Dead-weight Pressure Tester is a new model of Pressure primary Standard, with nitrogen or instrument used (purified) compressed air as power and can give out a precision pneumatic pressure signal. So it is an ideal testing equipment for various high precision pressure transmitters, differential pressure transmitters, pressure transmitter as well as precision pressure gauges, standard pressure gauges. (The tester is provided with a flow regulator, no additional operation will be made after adding on or taking away the weights and it is very easy for use.)