The Mark 14 Wright Respirometer is specially suited for measurement of tidal volumes and can also be used for measuring minute volume. This design incorporates separate dials and a small face diameter. The Large dial measures 1 liter per revolution and the small dial measures 10 liters per revolution. Features easy to use pushbutton on/off and reset controls. Units are also built to be sterilized by low-temperature hydrogen peroxide gas plasma systems. Inlet and outlet on this wright respirometer measure 22mm male fittings.