Dandong Top Electronics Instrument (Group) Co.Ltd (DDTOP) is an international organization with its business scope spanning manufacturing level meters, flow meters, level switches, flow calibration rigs, and magnetic pumps. It was founded in 1992 and is the qualified supplier of fortune 500 companies, such as ADNOC, SINOPEC, PetroChina, CNOOC, China Datang Corporation, China Shenhua, China Guodian Corporation. DDTOP provide the level and flow instrumentations and calibration rigs with high reliability and great price. Being one of the first companies who received the ISO 9000 and ISO 14000 certification in China, DDTOP can't stress more on product quality and the working environment's safety. Many products have ATEX, IECEx, SIL, PED certifications issued by German TüV Rheinland, IEC, France BV, and German TÜV SÜD respectively. DDTOP is rewarded as the national high-tech company, the nationally certified software company with software products. DDTOP is also FF Fieldbus Foundation member and HART foundation member, providing instrumentations to the oil & gas industry, petroleum & chemical industry, and thermal power generation industry. DDTOP would become your most reliable and trustable level and flow instrumentation specialist. Company website: http://www.ddtop.com/en/ Facebook: https://www.facebook.com/DDTOPInstrumentation Twitter: https://twitter.com/DDTOP_Global Contact us: Email:itrade@ddtoptrade.com Tel: (86)0415-6226466 (86)0415-6220927