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Onset HOBO MX800 Series Water Data Loggers

Onset Hobo MX800

HOBO MX800 Series wireless data loggers work with interchangeable sensors to provide a highly configurable solution for monitoring water conductivity/salinity, temperature, level, and dissolved oxygen (coming soon). Available in both an easy-to-deploy, fully submersible model (MX801) and a direct read model (MX802) for convenient data offload that doesn’t require having to remove sensors from the water.

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Key Features:

  • Compatible with interchangeable Conductivity, CTD (conductivity/temperature/depth), and DO sensors (sold separately) - swap out sensors for different applications
  • Bluetooth, for easy logger configuration and data offload
  • Easy to deploy, fully submersible (MX801)
  • Direct read for convenient data offload (MX802)
  • Logger diameter is less than 2 inches
  • Faster data offload via Bluetooth 5.0
  • Water detect feature indicates when logger was out of the water (MX801)
  • Barometric pressure sensor included (MX802)
  • Connect two sensors to one logger to get measurements like salinity adjusted DO directly, with no need for post-processing
  • Guided calibration ensures accurate data
  • User-replaceable batteries


Conductivity Measurements

Measurement Range: 

  • Electrical conductivity and specific conductance: 0 to 100,000 µS/cm
  • Salinity using PSS-78: 2 to 42 PSU
  • Total Dissolved Solids (TDS): 0 to 100,000 mg/L

Calibrated Range

  • Electrical conductivity: 50 to 80,000 µS/cm 5 to 35C 41 to 95F


  • Conductivity: +/-2% or 15 µS/cm whichever is greater
  • Salinity: +/-2% of reading or 0.1 PSU, whichever is greater


  • Conductivity 0.1 µS/cm from 0 to 1,000 µS/cm | 1 µS/cm from 1,000 to 10,000 µS/cm | 10 µS/cm from 10,000 to 100,000 µS/cm
  • Salinity: 0.01 PSU
  • TDS: 0.1 mg/L
Product Details
Onset Hobo MX800
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