HOBO UX100-003 Temperature/Relative Humidity 3.5% Data Logger

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The HOBO UX100-003 Temperature/Relative Humidity data logger records temperature and relative humidity (within 3.5% accuracy) in indoor environments with its integrated sensors. The data logger is ideal for monitoring occupant comfort in office buildings, tracking food storage conditions in warehouses, logging temperature trends in server rooms, and measuring humidity levels in museums.

Manufactured by: Onset
Model: HOBO UX100-003 Temperature/Relative Humidity 3.5% Data Logger

Services offered for this product

  • Sales
  • Rental
  • Installation
  • Calibration
  • Maintenance


Dew point
Relative humidity


Temperature Sensor
Range  -20° to 70°C (-4° to 158°F)
Accuracy ±0.21°C from 0° to 50°C (±0.38°F from 32° to 122°F)
Resolution 0.024°C at 25°C (0.04°F at 77°F)
Response time 4 minutes in air moving 1 m/s (2.2 mph)
Drift <0.1°C (0.18°F) per year
RH Sensor
Range 15% to 95% (non-condensing)
Accuracy ±3.5% from 25% to 85% including hysteresis at 25°C (77°F); below 25% and above 85% ±5% typical
Resolution 0.07% at 25°C (77°F) and 30% RH
Response time 43 seconds to 90% in airflow of 1 m/s (2.2 mph)
Drift <1% per year typical
Logger Operating Range
Logging -20° to 70°C (-4° to 158°F); 0 to 95% RH (non-condensing)
Launch/readout 0° to 50°C (32° to 122°F) per USB specification
Logging rate 1 second to 18 hours, 12 minutes, 15 seconds
Logging modes Normal, Burst or Statistics
Memory modes Wrap when Full or Stop when Full
Start modes Immediately, Push Button, Date & Time or Next Interval
Stop modes When Memory Full, Push Button, or Date & Time
Restart mode Push Button
Time accuracy ±1 minute per month at 25°C (77°F)
Battery life 1 year, typical with logging rate of 1 minute and sampling interval of 15 seconds or greater
Battery type One 3V CR2032 lithium battery
Memory 128 KB (84,650 measurements, maximum)
Download type USB 2.0 interface
Full memory download time 20 seconds
LCD LCD is visible from: 0° to 50°C (32° to 122°F); the LCD may react slowly or go blank in temperatures outside this range
Size 3.66 x 8.48 x 1.52 cm (1.44 x 3.34 x 0.6 in.)
Weight 30 g (1.06 oz)
Environmental rating IP50
The CE Marking identifies this product as complying with all relevant directives in the European Union (EU)