Calibration Test Rig for Venturi/ Orifice Meter is made using quality grade material to offer optimum performance and long lasting usage. The Calibration Test Rig is designed with a powder coated rigid mild steel frame and 0.5 HP capacity pump set. Calibration Test Rig is used for measuring discharge through venturi meter and orifice meter. Calibration Test Rig for Venturi/ Orifice Meter is provided with differential manometer for the measurement of loss in head, supplied with mercury.