2 Tube Rotameter (Rotameter) consist of housing and a set of calibration glass tube with bobbin float. Calibration tube can be provided in a combinations of (O2+N2O) or customers requirement. The flows control is obtained by needle valves which can be easily distinguished from one another by touch & colour. Easy to read large size scales with yellow acrylic sheet allow inside bobbins to be accurately read. Description: The gas flowmeter consists of two flowmeter tubes assembled together to work in parallel from two separate sources of gas supply and discharge through a single outlet. Control Valve: At inlet on the base of the front side of the instrument. Inlet Connection: At back, 1/8 inch BSP and 1/8 inch BSP (for O2 & N2O respectively), threaded male end. Outlet Connection: Female at 1/8" BSP(F)top back of o2 side of the frame.