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Little Environmental Observatory

The LEOs are portable sensor packs. It measures NO, NO2 and O3 using electrochemical sensors. It also provides the current temperature and relative humidity. The specifications of the node are as follows:

bettair static node
bettair static node

What does it measure?

The static nodes are composed of electrochemical (up to 3) sensors to measure (ppb or mg/m3):

  • NO2
  • NO
  • CO
  • O3
  • SO2
  • H2S

Other ambient quality indicators are also measured such as:

  • Temperature (ºC)
  • Relative humidity (%RH)

Size and Weight

  • Height: 81 mm (3.18 inches)
  • Width: 38.5 mm (1.52 inches)
  • Depth: 39.4 mm (1.55 inches)
  • Weight: 104 g


  • Bluetooth 4.0
  • Micro USB (charger only)

Power and Battery

  • Battery: 3.7V LiPo 900mAh
  • Integrated intelligent battery charger with battery protection: Overcharge, Overcurrent, Overdischarge
  • Charging time: 2 to 3 hours @ 700mA (nominal) using normal USB connection (cable provided)
  • Operating time from fully charged battery up to 60 hours
    • The smartphone’s battery depends on the model of the phone and use
  • Cycle life: 60% capacity after 500 charge/discharge cycles