A bi-colour level gauge is a type of level gauge that uses two different colours to indicate the level of a liquid or bulk material in a tank or vessel. It consists of a transparent tube with two different coloured sections, usually red and white, and a float that moves up and down with the level of the substance being measured. As the float moves up, the red section of the tube is visible, indicating the level of the substance, while as the float moves down, the white section becomes visible. This allows for a clear and easily visible indication of the level of the substance being measured, even from a distance. Bi-colour level gauges are commonly used in applications where visual indication is important, such as in chemical processing, pharmaceuticals, and food and beverage production. They are also popular in applications where high pressure or high temperature environments exist as they can be constructed with robust materials to handle these conditions.