Shanghai Jingoo Petroleum Apparatus Co.,Ltd Dear all  , This is Jeff from Shanghai Jingoo Petroleum Apparatus Co.,Ltd., China. Email: jeff@jingooapigage.com Web:www.jingooapigage.com  We specialize in distributing API gauges and offering professional calibration services. Please see attachments for our catalogue, API licenses & ISO certificate of the manufacturer we represent. Our company was founded in 2003 to represent the products of the top 2 API gauge manufacturers in China. Both of them are subsidiary facilities of state-owned corporations and are API-licensed. All our gauges come with third-party calibration  certificates that are traceable to China National Institute of Metrology and valid for API audit. We are serving 60% of the OCTG manufacturers and oilfield service companies in China, which include China National  Petroleum Corporation, China Petrochemical Corporation, China National Offshore Oil Corporation, Wuxi Seamless Oil Pipes  Company Limited, Weatherford China, etc. The advantages we offer are as below: Premium quality: Our gauges strictly meet the API specifications and are widely used by China National Petroleum  Corporation and China Petrochemical Corporation. Excellent price: Our company occupies 60% market share in China, we can offer best price to you. Immediate delivery: We keep plentiful stocks for our regular type and size gauges. Once you place the order, we can arrange  the delivery to you within 2 weeks. Third-party calibration: For all the gauges you buy from us, we will offer third-party calibration that is traceable to  NIST and valid for API audit. If you have the chance to come to China, we would be very happy to receive you and show you around our facilities. Look forward to hearing from you.