Profile: Key Instruments manufactures standard and custom flowmeters. Our flowmeters can be used for delivering oxygen to patients. They are capable of handling problems of viscosity, density, as well as extreme temperature, pressure, and corrosion. Our Series FR6000 oxygen and breathing air flow meters are made with high-impact resistant Lexan® hood and flow tube, combined with a sturdy machined brass base. These meters will stand up to the rigors of clinical or field use. The durable stainless steel stem valve assures precise control throughout the full flow range, and enables positive flow shut-off. O-Ring seals eliminate the leaks that are commonly associated with plastic base models. The main features of our custom flowmeters include choice of inlet, outlet, or no valve configuration, custom flow ranges, availability with precision (16 turn) or standard valves (9 turn), printing of customer logo & colors and availability of O-rings with Buna-N, Viton® or other optional elastomers.