Portavo 907 Multi Oxy optionally features a powerful Li-ion rechargeable battery that can be charged via USB directly in the device. The clear sensor diagram provides an at-a-glance view of the sensor condition.Portavo 907 Multi Oxy proves that high functionality and ease of use do not exclude one another. It guides you step by step through the calibration procedure. Technical terms are clearly explained in the context help.If equipped with the multi-channel option, Portavo 907 Multi Oxy can be used for simultaneous measurements using 2 flexibly combined sensors. The multi-channel function is added to the functionality of the data logger.