The Onset W-ADAPT-2 adapter lets you monitor multiple parameters by connecting any two sensors—DO, CT, and/or CTD—to a single HOBO MX800 water quality data logger.

Sensors can be attached directly to the fully submersible MX801 model, or to the end of a W-series cable that's connected to the direct-read MX802 model. Two sensors of the same type can be attached to monitor at multiple depths. When using a DO with CT or CTD combination, salinity-adjusted DO readings are logged directly without a need to perform post-processing.

The 2-sensor adapter comes with a sensor guard that screws onto the adapter to prevent damage to sensors while allowing ample water flow. Users also have an option to purchase an additional anti-biofouling guard (W-GUARD-2), which extends time between sensor cleanings by reducing fouling of the sensor.