HOBO® U20L-04 Data Logger Water Level (13 ft) The HOBO U20L-04 is a low-cost, research-grade water level data logger for continuously measuring water level and temperature in a wide range of underwater environments. It features 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. This data logger requires either the U-DTW-1 Waterproof Shuttle or the Base-U-4 Base Station for configuration and data offload, HOBOware software (free download). NOTE: HOBOware Pro is required when using the U-DTW-1 Waterproof Shuttle. See compatible items below. Helpful Links: Barometric Pressure Compensation Assistant Demo Multi-rate Sampling Demo Key Advantages: Self-contained non-vented design enables easy deployment Ideal for use in both fresh and saltwater environments, including wells, streams, lakes, wetlands, and tidal areas Depths up to 13 feet Durable ceramic pressure sensor withstands freezing HOBOware Pro software provides easy conversion to accurate water level reading, fully compensated for barometric pressure (see demo), temperature, and water density Note: A calibration certificate is not offered for this logger. If you require a NIST-traceable calibration certificate, please see the U20-001-04 (freshwater) or U20-001-04-Ti (saltwater).

HOBO U20L-04 Data Logger Specifications Pressure (Absolute) and Water Level Measurements U20L-04 Operation Range 0 to 145 kPa (0 to 21 psia); approximately 0 to 4 m (0 to 13 ft) of water depth at sea level, or 0 to 7 m (0 to 23 ft) of water at 3,000 m (10,000 ft) of altitude Factory Calibrated Range Burst Pressure Water Level Accuracy* Typical error: ±0.1% FS, 0.4 cm (0.013 ft) water Maximum error: ±0.2% FS, 0.8 cm (0.026 ft) water Pressure Response Time (90%)*** <1 second at a stable temperature; measurement accuracy also depends on temperature response time Temperature Measurements Operation...

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