An Orifice Meter Apparatus is essentially a sort of stream meter employed to quantify the rate of stream of Liquid or Gas, particularly Steam, utilizing the Differential Pressure Measurement rule. It is for the most part utilized for vigorous applications as it is known for its solidness and is exceptionally efficient. As the name suggests, it comprises of an Orifice Plate which is the essential component of the instrument. At the point when this Orifice Plate is put in a line, a differential weight is created over the Orifice Plate. The gadget is utilized for the estimation of stream rate, for reducing weight or for limiting stream. The Orifice Meter Apparatus is also rendered with adjusted hole that can be aligned with a correct liquid stream as well as a traceable stream estimation gadget.