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Boshi Electronic Instrument Technical Datas 1.Basic error: ±5%F.S 2. Repeatability: ≤3%F.S 3. Zero drift: ≤±1PCU 4.Measurement principle: Platinum cobalt standard colorimetric method Description Colorimeter uses photoelectric colorimetric principle to test the chroma of aqueous solution.The instrument is calibrated by the standard solution of platinum cobalt standard in the national standard GB5750.It can be widely used in chroma test of power plant, pure water and tap water plants, sewage treatment plants, beverage plants, environmental protection departments, industrial water, wine industry, pharmaceutical industry, hospitals and epidemic prevention departments so as to achieve the required water quality standards. Note All products have been checked and packaged in good condition before shipping. After your order is confirmed,the product will be sent to your hands for 7-13 workdays. If you have any question, please feel free to contact with us . We will try our best to give you a satisfactory solution.