Each flowmeter consists of a heavy-walled glass flowtube mounted in a frame with white acrylic back plate (1/8" thick). Aluminum Flowmeters are economical and good for general use with noncorrosive gases and liquids. Brass Flowmeters are economical and good for use with water. 316 Stainless Steel Flowmeters feature excellent chemical compatibility. Select a flowmeter with a high-resolution valve for superior flow rate control¿ideal for low-flow applications or for any application where you need precise flow control. All flowmeters come with correlation data sheets for water and air at standard temperature and pressure (STP). We can also supply calibration data for oxygen, nitrogen, hydrogen, helium, CO2, argon, other liquids and gases, and for conditions other than STP ¿ call our Application Specialists for more information.