The economy-grade water quality testing instrument TianEr TE-3000plus is a multifunctional water quality measurement device that quickly detects the content of COD, ammonia nitrogen, total phosphorus, total nitrogen, and more in water. The instrument features an intelligent touch screen design for simple, convenient, and fast operation.Utilizing fiber optic detection technology, 360° rotating detection, 5-inch color LCD touch screen, imported light source, built-in specialized water quality testing system, stable performance, accurate measurement, wide measurement range, powerful functions, simple operation, concentration direct reading, fully meets the testing requirements of "HJT399—2007 Determination of Chemical Oxygen Demand in Water Quality by Rapid Dissolution Spectrophotometry," "HJ535-2009 Determination of Ammonia Nitrogen in Water Quality by Nessler's Reagent Spectrophotometry," and "GB11893-89 Determination of Total Phosphorus in Water Quality by Molybdate Spectrophotometry."，Quickly detect various water pollutants such as COD, ammonia nitrogen, total phosphorus, and total nitrogen in water.