The Salter Labs PRO2 Check Elite Ultrasonic Oxygen Indicator is a multifunctional device designed to provide fast, accurate, and maintenance-free oxygen measurements. Using advanced microprocessor-controlled ultrasonic technology, it delivers reliable readings of oxygen concentration, flow rate, and outlet pressure without the need for regular calibration or service. With a simple one-button calibration check, users can instantly verify accuracy, ensuring confidence in every measurement. Compact and lightweight, the PRO2 Check Elite is easy to use in both clinical and home care environments. Wide Compatibility: The PRO2 Check Elite is intended for use with most oxygen concentrators (molecular sieve type). It may also be used for spot-checking oxygen concentration from liquid oxygen and oxygen cylinders. Not for use with anesthesia systems. Whether for healthcare providers who must comply with accreditation standards or for individuals who want assurance of their oxygen therapy quality, the PRO2 Check Elite offers precision, convenience, and peace of mind.