Part Number - U24-001

HOBO Fresh Water Conductivity Data Logger

Fresh Water

$985.00 USD
Measures and records conductivity and temperature in streams, lakes, and other freshwater sources; recommended for monitoring aquifers for saltwater intrusion and road and agricultural runoff.

Important Information

Requires HOBOware Pro software and either a U-DTW-1 Waterproof Shuttle or the Base-U-4 Optic USB Base Station for configuration and data offload. Please see compatible items below.


A high-accuracy, cost-effective data logger that measures and records conductivity and temperature in streams, lakes, and other freshwater sources. Recommended for monitoring aquifers for saltwater intrusion and road and agricultural runoff, this logger's open access to its sensor simplifies cleaning and maintenance, and its non-contact sensor minimizes measurement errors related to drift. Also features software-based drift compensation.

The titanium pentoxide coating on the non-contact sensor prevents it from coming into contact with the water, thereby preventing tarnishing or corrosion associated with traditional electrode sensors. This sensor coating is also inert, so fouling can be easily wiped off the sensor.


  • Titanium pentoixed coated non-contact sensor rovides long life and less measurement drift
  • Provides easy access to sensor for cleaning and shedding air bubbles
  • HOBOware Pro software enables start/end-point calibration to compensate for any fouling and provides easy conversion to specific conductance and salinity
  • USB optical interface provides high-speed, reliable data offload in wet environments
  • Compatible with the HOBO Waterproof Shuttle for easy and reliable data retrieval and transport


Measurements Actual Conductivity, Temperature, Specific Conductance at 25°C (calculated)
Conductivity Calibrated Measurement Ranges Low Range: 0 to 1,000 µS/cm
Full Range: 0 to 10,000 µS/cm
Conductivity Calibrated Range - Temperature Range 5° to 35°C (41° to 95°F)
Conductivity Extended Ranges Low Range: 0 to 2,500 µS/cm
Full Range: 0 to 15,000 µS/cm
Temperature Measurement Range -2° to 36°C (28° to 97°F)
Specific Conductance Accuracy (in Calibrated Range) Low Range: 3% of reading, or 5 µS/cm, and
Full Range: 3% of reading, or 20 µS/cm, whichever is greater, using Conductivity Data Assistant and calibration measurements
Conductivity Resolution 1 µS/cm
Temperature Accuracy 0.1°C (0.2°F) at 25°C (77°F)
Temperature Resolution 0.01°C (0.02°F)
Conductivity Drift Less than 3% sensor drift per year, exclusive of drift from fouling
Response Time 1 second to 90% of change (in water)
Operating Range -2° to 36°C (28° to 97°F) - non-freezing
Memory 18,500 temperature and conductivity measurements when using one conductivity range; 11,500 sets of measurements when using both conductivity ranges (64 KB total memory)
Sample Rate 1 second to 18 hrs, fixed or multiple-rate sampling with up to 8 user-defined sampling intervals
Clock Accuracy ±1 minute per month
Battery 3.6 Volt lithium battery
Battery Life 3 years (at 1 minute logging)
Maximum Depth 70 m (225 ft)
Weight 193 g (6.82 oz), buoyancy in freshwater: -59.8 g (-2.11 oz)
Size 3.18 cm diameter x 16.5 cm, with 6.3 mm mounting hole (1.25 in. diameter x 6.5 in., 0.25 in. hole)
Wetted Housing Materials Delrin®, epoxy, stainless steel retaining ring, polypropylene, Buna rubber O-ring, titanium pentoxide (inert coating over sensor)
Environmental Rating IP68

Description: ce
The CE Marking identifies this product as complying with all relevant directives in the European Union (EU).

Compatible items

Data Offload - Base Stations - Shuttles - Couplers

$325.00 USD

Protective Covers and Boots

$26.00 USD

Protective Enclosures

$57.00 USD

Stainless Steel Cable/Crimps

$485.00 USD
$105.00 USD
$44.00 USD

Well Caps

$65.00 USD

Compliance Certificates

$30.00 USD

Data Offload - Base Stations - Shuttles - Couplers

$175.00 USD
$325.00 USD

Graphing & Analysis

$75.00 USD
$99.00 USD

What's in the box

  • HOBO U24-001 Conductivity Data Logger
  • Communications window protective cap


HOBO U24 Conductivity Logger (U24-001) User's Manual

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HOBO U24 Conductivity Logger (U24-001 and U24-002-C) Quick Start

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