CM Flowmeters [India] Private Limited manufactures Anesthetic Rota Meters Unit. CM Flowmeters [India] Private Limited is an ISO 9001:2000 certified company. The Anaethetic Rota Meters Unit is designed for industrial and scientific customers, for use with a wide range of liquids and gases. This includes glass and stainless steel metering tubes as well as Bypass Rota meters for measuring relatively large flow rates. The Anesthetic Rota Meters Unit gives a highly accurate and reliable indication of gas flow rates in anesthesia machines.