TUB-430 Turbidity Meter Features: 1.Microprocessor based for fast and accurate measurements. 2.ISO 7027 measurement method. 3.Large LCD 45 x 25 mm display for reading convenient. 4.Unit NTU, FTU, EBC are changeable. 5.Memory function stores and recalls up to 150 points. 6.Low battery alarm and auto shut off after 10 minutes of non use.