Vayubodhan Upkaran Pvt. Ltd. Manufactures Stack Velocity Monitor with Digital Pyrometer. Vayubodhan Upkaran Pvt. Ltd. Supplies air pollution monitoring instruments. Stack Velocity Monitor with Digital Pyrometer is designed to determine the velocity of gases in stationary sources where determination of the rate of flow inside a chimney is of interest. Stack Velocity Monitor with Digital Pyrometer can be used very conveniently to measure the total quantity/volume of the emissions. It is also provided with a thermocouple, an inclined cum vertical manometer and a calibrated pitot tube. This velocity monitor is a simple instrument used to measure velocity and temperature of flue gases.