The flowmeter Model DS20 works according to the proven variable area principle. A float is guided in a cylindrical measuring tube. The flowing medium moves the float in the flow direction. An externally mounted pointer indicator is magnetically coupled to the float and thus, following the float position, indicates the flow rate on a scale. This indicator assembly is equipped with a scale calibrated to the operating conditions in the system and additionally may contain alarm contacts or an analog output. Model DS20 is used for measuring and monitoring the flow of low viscosity liquids and gases, i.e. in cooling circuits of welding machines and laser systems, for pump monitoring, compressors and many other applications. By using only stainless steel AISI 316 Ti for the wetted parts the meter is especially suited for aggressive media.