Features Reliable & Accurate Results Measurements up to 1000 NTU 3½ Digit 7-Segment LED Display Sewage and Drinking Water Testing Clarity of water is extremely important in products destined for human consumption. Suspension free water is also considered necessary for industries manufacturing beverage, food products, etc. Similarly, minimum limits of turbidity are required to be observed in drinking water & sewage disposals.EU's Digital Turbidity Meter and Nephelometer are ideal instruments for the measurement of suspensions. They consist of a light source focused on a test tube containing the sample solution under test. The light, reflected at a right angle to the focused light by the suspension in the solution, is detected by the photoelectric detector, amplified and displayed on a 3½ digit LED display.