Ningbo Beilun GC-BOB Instrument Co.,Ltd. is an ISO 9001 manufacturing company offering over 1,000 different styles of gauge, vacuum and testing instruments. which include: Standard Economy Pressure Gauge, Liquid Filled Stainless Steel Pressure Gauge, Vacuum Gauge,Differential Pressure Gauge, Mining Gauge, Spiral Tube Fire and Oxygen Pressure gauges etc. Our quality control procedures are among the best in our industry.