ZD Instrument Ltd. (Taizhou Zhengda Scientific Education Instrument & Equipment Factory) is a specialized manufacturer of electro-chemistry and soil testing instruments. Our main products are pH Meters, Soil pH & Moisture Tester, Soil EC Tester, Soil Temperature & Humidity Tester, Soil Available N-P-K Tester, Conductivity Meters, "Nutra Wand® " Hydroponics Nutrient Tester, TDS, PPM, PPt, mS/cm, uS/cm Meters, EC, CF Check, Household and Seawater Salinity Tester, Continuous Reading pH/Conductivity/ mV/Temperature Monitors and pH Combined Electrodes, Water Cluster pH Composite Electrode, Dissolved Oxygen (DO) Electrodes, Conductivity and ORP Electrodes, etc. Bearing in our mind that our customers need most reliable instruments, we have always been doing our utmost to supply quality products in our years of history. With the efficient efforts of our R&D team, new products are coming out all the time. We have passed the ISO9001 quality management system certification in recent years and Obtained Private Technology Enterprises, High-tech Enterprises, National Quality Inspection and Standard Qualified Products, Famous Brands in China, National Science and Technology Innovation Enterprise, Analytical Instrument Industry Famous Enterprise in China, Analytical Instrument Industry Investment Value Enterprise in China, Influential Enterprises in the Analytical Instrument Industry in China, High-quality Service Integrity AAA-level Enterprise in China, Contract-honoring and Trustworthy Enterprise. Most of our products have also passed CE certification and are sold to all the continents in the world. We wholeheartedly welcome friends from all walks of life at home and abroad to come to cooperate or other forms of trade cooperation.