UX90-002M Light On Off Logger


  • Light Threshold: > 65 lux
  • Light Type: LED, CFL, fluorescent, HID, incandescent, natural
  • Auto-calibration of ON and OFF thresholds ensures reliable readings
  • User adjustable sensitivity control for low/high light level conditions

Additional Equipment Required

SKU: UX90-002M Categories: , ,


The HOBO® UX90-002M Light On/Off data logger monitors indoor light changes with an internal sensor and records light on and off conditions, making it ideal for building energy audits and light usage analysis.

The LCD Display shows current readings, battery level, alarm status and storage capacity. The HOBO UX90-00M2 Light On/Off Data Logger is capable of over 346,795 measurements and is battery-operated with 1 year battery life with typical usage.

HOBO and Onset are trademarks of Onset Computer Corporation, Bourne, Massachusetts (USA).


Light Threshold: > 65 lux
Light Type: LED, CFL, fluorescent, HID, incandescent, natural
Time Accuracy: ±1 minute per month at 25°C (77°F)
Battery Life: 1 year typical use
Memory: 512 KB (346,795 measurements, maximum)
Download Type: USB 2.0 interface
Download Time: 10 seconds for 128 KB; 30 seconds for 512 KB
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
Launch / Readout: 0° to 50°C (32° to 122°F) per USB specification
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 5.94 x 1.52 cm (1.44 x 2.34 x 0.6 in.)
Weight: 23 g (0.81 oz)
Environmental Rating IP50
The CE Marking identifies this product as complying with all relevant directives in the European Union (EU)


Onset® HOBOware software supports all HOBO® data loggers and is available free for download.

Standard Features

  • Simple menus for fast, easy logger setup and readout
  • Point & click for fast setup and readout
  • Scaling to real-world engineering units
  • Presentation-quality graphs
  • Easy export of data files to text or Excel format
  • Free download

Easy Setup

Logger setup and readout is fast and easy with simple, intuitive windows.

Powerful Tools

Graphing and analysis tools allow you to plot, analyze and extract key data with just a few simple clicks.


Presentation Quality Graphs

Easily create high-quality visual presentations of your data.

HOBOware Pro Software

In addition to the free standard HOBOware software, a Pro version is available for purchase. HOBOware Pro features include:

  • Time-saving tools for fast setup & readout
  • Advanced plotting tools for more precise data analysis
  • Access to Data Assistants for post-processing data
  • Ability to create Pie Charts
  • Crop a series to a specific time frame
  • Subset Statistics Tool for details within a time frame
  • 21 CFR Part 11 Compliance
  • Data Shuttle support
  • HOBOnode Manager to support ZW Data Nodes