Specifications include, but are not limited to: To obtain a single source of online process monitoring and benchtop laboratory turbidimeters for use at the City of Tulsa’s water treatment plants and other facilities. It is the City’s intention to purchase both online and benchtop turbidimeters from the same manufacturer. A. Suitable for continuous online use at potable water treatment facilities with turbidity ranging between 0.01 NTU and 100 NTU.B. The turbidimeter shall be used or tested at one of City facilities in the past three years with satisfactory results.C. Measurement range: 0-10 NTU pre-calibrated. 0-100 NTU calibration file included on a USB thumb drive.D. Accuracy: 2% of reading or +/- 0.02 below 40 NTU (whichever is greater), 5% of reading above 40 NTU.E. Resolution: 0.001 (below 10 NTU).F. Light source: White Light or Infrared (860 nm LED).G. Measurement principle: 90° Nephelometry.