Starting at $299.00

Not in stock. Usually ships in 1-2 weeks [?]

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  • Water Level, Barometric Pressure, Pressure (Absolute), Temperature measurements
  • Self-contained non-vented design
  • Fresh and salt water environments
  • Up to 100 ft water level range (0 to 58 psia)
  • Water level accuracy ± 0.1% FS
  • Temperature range: -4 to 122°F (-20 to 50°C)
  • Temperature accuracy: ±0.37° @ 20°C/±0.44° from 0 to 50°C
  • Durable ceramic pressure sensor

The HOBO U20L Series Water Level Loggers set a new standard for price/performance for accurate water level and temperature monitoring. Priced at just $299, the loggers combine 0.1% measurement accuracy, a polypropylene housing for use in both fresh and salt water, and a non-vented design for convenient and hassle-free deployment.

The U20L Series can be used in a range of environmental monitoring applications, from ecology studies to hurricane storm surge monitoring.

Required Components

These additional components are required for the operation of your product. We strongly advise you to purchase these components unless you already own them or own a suitable alternative.

HOBO BASE-U-4 Optic USB Base Station
Used to offload data from any HOBO data logger with an Optic USB interface, splash resistant
In Stock


HOBO HOBOware Pro Software
Plot or export data to spreadsheets, time saving tools to fast setup, readout and export, compatible with all HOBO data loggers
In Stock


Please consider these optional accessories.

HOBO U-DTW-1 Waterproof Shuttle Data Transporter
Compatible with all HOBO U-Series loggers with optic USB, waterproof up to 20m (66ft), requires HOBOware Pro software
HOBO HOUSING-U2X Protective Housing
The HOUSING-U2X Housing is for use in Underwater environments


This product can be used in the following applications: