Shanghai Sinsoledad Co., Ltd. specializes in design, manufacturing and sales. The main markets are the United States, United Kingdom and Australia. We are European Rohs and CE certified. With some of the most qualified and experienced engineers, we can constantly update our products and always provide you with satisfying idea products. As a company, we have many unique designs. We also accept designs according to customer's request. The company has over 10 years of R & D team, sales team, production team and quality control team. The original design builds trust with customer first, quality first and outstanding concepts. Our products: High Precision Laboratory Benchtop pHORP Meter, Strong Acid Alkali pH Electrode, Dissolved Oxygen Sensor for Trace Oxygen, High Precision Benchtop TDS Meter, Swimming Pool Water Quality Monitor System, Blue-green Algae Sensor RS485, Waterproof Pen Type TDS Tester, (NO2- ) Digital Pocket Size Nitrite Meter, High Precision Laboratory Digital Conductivity Meter-, Petrochemical Industry pH Environment Electrode