Digital rotameter has been widely utilized in the process industry as an industrial meter. It can monitor gas for filtration loading. It works on the principle of variable area and provides the local indication without the requirement of any auxiliary power. Other benefits of the said instrument are minimum pressure losses, simplicity in reading, accurate measurement even at higher flow and capacity to function in low flow (1 LPH). Digital rotameter needs no external power or fuel and utilizes the force of the gravity and fluid to measure accurate flow rate. It is an inexpensive solution, which keeps the user costs low.