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HOBO Dissolved Oxygen Data Logger - U26-001


About Dissolved Oxygen Data Logger

Dissolved Oxygen

Measure oxygen concentrations in lakes, streams, rivers, estuaries, and coastal waterswith the HOBO U26 Dissolved Oxygen Data Logger. This affordable and precise data logger is recommended for aquatic biology and hydrology research projects. The HOBO U26 uses RDO® Basic (Rugged Dissolved Oxygen) optical DO sensor technology and is easy to maintain.



The U26-001 Data Logger is for use in Underwater environments



The U26-001 Data Logger supports the following measurements:

Temperature • Dissolved Oxygen


Features :

  • Affordable, high performance dissolved oxygen (DO) monitoring with 0.2 mg/L accuracy
  • Optical DO sensor technology for long-lasting calibration with less maintenance
  • HOBOware Pro's Dissolved Oxygen Assistant software corrects for measurement drift from fouling; provides salinity-adjusted DO concentrations and percent saturation.
  • Optical USB interface for high-speed, reliable data offload.
  • Easy-to-replace DO sensor cap lasts six months.

NOTE: For DO measurements in saltwater, an adjustment for salinity is required. For waters with small changes in salinity (<2 ppt), a salinity meter reading typically provides enough accuracy. For environments with greater salinity changes, we generally recommend the HOBO U24-002-C conductivity logger .


NOTE: If you need DO in Percent Saturation, barometric pressure data is required, which can be logged with a HOBO Water Level Data Logger (U20-001-04).


To see the full specifications for this product, please see our product manual found under the documentation tab.


Dissolved Oxygen  
  Sensor Type Optical
  Measurement Range 0 to 30 mg/L
  Calibrated Range 0 to 20 mg/L; 0 to 35°C (32 to 95°F)
  Accuracy 0.2 mg/L up to 8 mg/L; 0.5 mg/L from 8 to 20 mg/L
  Resolution 0.02 mg/L
  Response Time To 90% in less than 2 minutes
  DO Sensor Cap Life

6 months, cap expires 7 months after initialization



  Temperature Measurement/Operating Range -5 to 40°C (23 to 104°F); non-Freezing
  Temperature Accuracy 0.2°C (0.36°F)
  Temperature Resolution 0.02°C (0.04°F)
  Response Time

To 90% in less than 30 minutes



  Memory 21,700 sets of DO and temperature measurements (64 KB total memory)
  Logging Rate 1 minute to 18 hours
  Time Accuracy ±1 minute per month at 0 to 50°C (32 to 122°F)
  Battery 3.6 V lithium battery; factory replaceable
  Battery Life 3 years (at 5 minute logging)
  Download Type Optical
  Depth Rating 100 m (328 ft)
  Wetted Materials Black Delrin®, PVC, EPDM o-rings, silicone bronze screws; rated for saltwater use
  Size 39.6 mm diameter x 266.7 mm length (1.56 x 10.5 inches)
  Weight 464 g (16.37 oz)
  Description: ce The CE Marking identifies this product as complying with all relevant directives in the European Union (EU).