Five commercially available turbidity sensors were field tested by the U.S. Geological Survey (USGS) Hydrologic Instrumentation Facility (HIF) for accuracy and data comparability. The five tested turbidity sensors were the Xylem EXO, the HACH Solitax sc, the In-Situ Aqua TROLL 600 sensor, the Campell Scientific OBS501, and the Observator ANALITE NEP-5000 (sidescatter only). All sensors are compliant with International Organization for Standardization (ISO) 7027 standard for turbidity sensors.
