Onset HOBO UX90 Occupancy/Light Data Logger

The Onset HOBO UX90 Occupancy/Light data logger monitors room occupancy and indoor light changes to identify occupancy patterns and determine energy usage and potential savings.


  • Measures room occupancy up to 12m
  • LCD screen with displayed signal strength
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The Onset HOBO UX90 Occupancy/Light data logger monitors room occupancy and indoor light changes to identify occupancy patterns and determine energy usage and potential savings. The 128 KB memory is capable of logging up to 84,650 measurements.

Occupancy Sensor
Detection Range Maximum 12 m (39.4 ft)
Light Sensor
Light Threshold  > 65 lux
Light Type LED, CFL, Flourescent, HID, incandescent, natural
Memory Modes  Wrap when full or stop when full
Start Modes Immediate, push button, date & time, or next interval
Stop Modes  When memory full, push button, or date & time
Power Source  One 3V CR2032 lithium battery and USB cable
Battery Life  1 year typical use
Memory 128 KB (84,650 measurements, maximum)
Download Type USB 2.0 interface
Full Memory Download Time  10 seconds for 128 KB
Operating Range  Occupancy Sensor Range: 20° to 60°C (-4° to 140°F); 15 to 85% RH (non-condensing)
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 2.36 cm (1.44 x 3.34 x 0.93 in.)
Weight  30 g (1.06 oz)
Environmental Rating  IP50
  • HOBO UX90 Occupancy/Light Data Logger
  • Command strip
  • Double-sided tape
  • Hook & loop strap
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Onset HOBO UX90 Occupancy/Light Data Logger
HOBO UX90 occupancy/light time-of-use logger (128K) 12m range
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