The HOBO MX801 Conductivity & Temperature Kit delivers an easy, modern way to monitor key water quality parameters. This kit pairs the Bluetooth-enabled, fully submersible MX801 logger with a high-accuracy conductivity and temperature sensor, giving you reliable performance in both freshwater and saltwater applications.

Designed for effortless setup and rapid data offload via HOBOconnect, the MX801 offers a smart upgrade path from legacy U24 loggers. The included CT sensor captures conductivity and temperature, enabling calculations for specific conductance, salinity, and TDS—all in one compact, durable probe.

Key Features:

• Bluetooth connectivity for quick, wireless logger setup and fast data offload
• Fully submersible design for easy, reliable deployment in a wide range of water environments
• Slim profile (<2″ diameter) for use in tight spaces, wells, and narrow deployment locations
• Water detect function automatically flags when the logger was out of the water
• Guided calibration workflow ensures accurate, repeatable measurements
• User-replaceable batteries for simple maintenance and extended field use
• Includes MX801 Submersible Data Logger and Conductivity & Temperature (CT) sensor

Need to track additional parameters, like Dissolved Oxygen or Depth?
No problem— Learn more about MX800 Multiparameter Data Loggers and configure a customised version HERE >>

Everything you need to start monitoring

MX801 Multiparameter Data Logger

Fully submersible Bluetooth-enabled logger designed for fast setup, guided calibration, and wireless data offload. Supports up to two interchangeable MX800 sensors for flexible water monitoring.

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W-CT Conductivity & Temperature Sensor

Versatile, durable sensor measuring conductivity and temperature, enabling specific conductance, salinity, and TDS calculations. Features a 4-electrode design and rapid-response temperature element for accurate results in fresh or saltwater.

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See the MX800 Logger User Guide page for Data Logger and CT Sensor Specifications

View the resource here >>

Download the free HOBOconnect app for your iOS or Android mobile device or Windows computer today.

Onset’s HOBOconnect app, accessed from a free download from the iTunes or Google Play app store, or your pc, makes it quick and easy to configure compatible MX Series data loggers (chart below) and manage the collected data. From your mobile device, tablet, or Windows computer, users can view data in graphs, check the operational status of loggers, share data files and graph images for analysis in Excel, Numbers, and other applications, and store data in the cloud. HOBOconnect also makes it fast and easy to set up audible alarm notifications so users are immediately notified of problems.

Learn more about HOBOconnect >>