The SUTRON Accubar® Constant Flow (CF) Dual Orifice Bubble Gauge/Recorder, a self-contained, precision device for measuring water levels, water temperature*, suspended sediment* & density* using long established bubble gauge principles, in a single package. Ideal for rivers, streams, dams and reservoirs, as well as oceans, industrial areas, plus any area where water density changes, e.g., tidal & estuary areas.