The MaxO2+A analyzer was designed for simplicity and portability—ideal for checking the accuracy of delivered oxygen percentage in concentrators. Its patented, ergonomic design fits comfortably in your hand and features a simple, one-touch calibration and ON/OFF control. The MaxO2+A will calibrate to room air (20.9%) or 100% oxygen. For applications that require an external sensor, check out our MaxO2+AE.