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

SKU: UX100-003

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.

Highlighted Features

  • Easy-to view LCD display
  • Large memory capacity
  • Visual high & low alarm thresholds
  • New Burst and Statistics logging modes
  • User-replaceable Relative Humidity sensor
  • Compatible with HOBOware and HOBOware Pro software for logger setup, graphing and analysis
Temperature Sensor


RH Sensor



15% to 95% (non-condensing)


±3.5% from 25% to 85% including hysteresis at 25°C (77°F); below 25% and above 85% ±5% typical


0.07% at 25°C and 30% RH

Response Time

43 seconds to 90% in airflow of 1 m/s (2.2 mph)

Cable length

1.83 m (6 ft)


<1% per year typical



Operating Temperature Range

-20° to 70°C; 0 to 95% RH (non-condensing)


0° to 50°C 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

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


128 KB (63,488 measurements, maximum)

Download type

USB 2.0 interface

Full memory download time

20 seconds


LCD is visible from: 0° to 50°C; the LCD may react slowly or go blank in temperatures outside this range


3.66 x 8.48 x 2.29 cm


30 g

Environmental rating


HOBO UX100 Data Sheet