Check ultrasonic oxygen indicator is a handheld device for measuring the oxygen output of an oxygen concentrator. It uses ultrasound technology to measure the speed of sound through various gases, which is a new method of indicating oxygen concentration. Features of the device include one-button calibration, 9-volt battery operation and no fuel cells to replace.
O2 Technologies, 11341-C Business Center Dr, Richmond, VA 23236. Tel: 804-897-8555; Fax: 804-897-9549.