ZD Instrument Corp.(Taizhou Zhengda Scientific Education Instrument & Equipment Factory) is a specialized manufacturer of electro-chemistry instruments. Our main products are pH Meters; Soil PH & Moisture Meter; Conductivity Meters; Portable Flattopde pH/Temp Check; "Nutra Wand" Hydroponics Nutrient Meters; TDS, PPM, PPt, mS/cm, uS/cm, EC, CF Meters; Salinity Meters; Continuous Reading PH/mV/Conductivity/Temperature Monitors and pH Combined Electrodes; 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. Most of our products are CE certificated and are sold to all the continents in the world. With the efficient efforts of our R&D team, new products are coming out all the time.www.zdinstrument.com (JIANGYAN ZHENGDA SCIENTIFIC EDUCATION INSTRUMENT & EQUIPMENT FACTORY.)No.64 Xihuan South Road, Jiangyan, Jiangsu Province, CHINA Zip:225500Tel:86-523-8888299158 Fax:86-523-88299156, 8272807