Water Environment NADH Meters (Microbial metabolism coenzyme monitor) NF-10 UV Meters (Organic contamination monitor) Model UV-10 Optical Dissolved Oxygen Meters Model OD-10 Dual scattered-light Sludge Density Meters Model SD- Ultrasonic Pulse Coherent Flowmeters Model FM-10 Submerged Level DetectorsFor chemicals, seawater model SL-710C Submerged Level Detectors Small diameter model SL-232B Submerged Level DetectorsFor sewage water model SL-180C Submerged Level DetectorsFor clean water model SL-180B