miniDOT® Clear Logger Submersible water logger for measuring dissolved oxygen with LCD Screen

The miniDOT Clear logger is a completely submersible instrument that logs dissolved oxygen and temperature measurements and has an internal LCD screen, which displays real-time measurements. The oxygen sensor is an optode that measures dissolved oxygen concentration in water through a fluorescence method. Data are recorded to an internal SD card. Operation of the miniDOT Clear Logger such as setting the time and sample interval can be accomplished via the USB cable.

Learn more about water temperature here.

Learn more about dissolved oxygen here.


  • Portable, completely submersible, easy to operate
  • User replaceable batteries and long lasting in the field
  • Real-time dissolved oxygen reading
  • Records time, date and battery voltage
  • Anti-fouling available
Get a Quote

Commonly Used for Measuring

More about the miniDOT® Clear Logger

  • User replaceable batteries
  • 100 Meter depth rating
  • Shipped calibrated
  • Portable and easy to use

The miniDOT Clear logger measures dissolved oxygen in water and is completely self contained. It includes an optical DO sensor, a temperature sensor, batteries and a micro SD memory card. The logger collects measurements of dissolved oxygen with an accuracy of +/- 5% and temperature to +/- 0.1 degrees C. All measurements are stored internally. Data can be offloaded to a computer via the miniDOT USB cable. Temperature range is 0 to 35 degrees C with an accuracy of +/- 0.1 degrees C. Oxygen range is 0 to 150% saturation with an accuracy of +/- 10 umole/L.

PME also has an anti-fouling wiper compatible with the miniDOT logger and miniDOT Clear logger. Increase your data longevity by using the PME wiper. More about the miniWIPER.

Product Design

The miniDOT Clear logger is constructed from a delrin plastic, which is a hard material that does not easily crack or break. All internal sensor components have been specifically designed to fit on the logger spine. The black sensor cover allows the user to easily grip and unscrew the top.

Logger Information & Sensor Specifications

The miniDOT sensor is an optode that measures lifetime-based luminescence quenching of a thin membrane. The sensing foil contains a coating that has a variable fluorescence that depends upon oxygen concentration in the surrounding water. The sensor is able to compute oxygen concentration in mg/L and record these measurements internally. Every miniDOT Clear logger is calibrated at PME headquarters. PME calibrates each logger at 12 oxygen concentrations each at 8 temperatures for a total of 96 calibration points. The miniDOT Clear logger can sample between once every minute to once every hour. Contact PME for sample intervals outside this range.

Sample Interval Minutes Days of SamplingNumber of Samples
1 365 500K
10 365 + 52,000 +
60 365 + 8,000 +

Downloads & Resources


Jamie Anderson, VP of I. F. Anderson Farms, explains how the miniDOT Clear Logger helped bring a deeper understanding to farm operations by correlating real-time dissolved oxygen measurements to changes in temperature.