MDG-XB-type fire extinguisher nitrogen filling machine filling and dual-use school table is produced Raoyang Hongyuan developed an integrated device. Nitrogen filling the machine with the pressure gauge testing combination as a whole, can be used as nitrogen filling equipment can also serve as test pressure gauge, one machine can realize the optimal combination product is safe, easy operation, work efficient detection of potential advantages such as pressure gauges, is fire-fighting equipment production, maintenance, ideal for manufacturers. XBY type calibrator is available to all fire apparatus equipment production, maintenance manufacturers, fire extinguisher cylinders of various Xu Yong pressure gauge which shows the internal checksum. So that the pressure inside the cylinder at the pressure gauge on the accuracy of the response to the detection of fire extinguishers more intuitive. Table instrument school system and deflated by the pneumatic system of two parts, with safe, reliable, easy operation, high efficiency, high precision calibrator, is the production of fire equipment, maintenance, manufacturers of various fire extinguishers necessary pressure gauge Check the test equipment.