Unihedron Sky Quality Meter

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Unihedron Sky Quality Meter
Item # UH-SQM
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  • Just how good are the skies at your observing site? Are some times better than others? Are you fighting light pollution in your community and need ammunition?
  • Find out the answers to these questions and more with the Unihedron Sky Quality Meter!
  • The Unihedron SQM Measures the brightness of the sky in magnitudes per square arcsecond.
  • CCD users can make a correlation between the Unihedron SQM reading and when the background reaches some ADC level.
  • Runs on a 9V battery, included.


Finally, an affordable meter for measuring sky brightness!

The Unihedron "Sky Quality Meter" measures the brightness of the night sky in magnitudes per square arcsecond.

Unprecedented sensitivity in a handheld meter!

Designed by Dr. Doug Welch and Anthony Tekatch


  • Find out how good the night or site REALLY is.

  • Compare the sky brightness at different sites quantitatively.

  • Document the evolution of light pollution in your area.

  • Set planetarium dome illumination to mimic the skies people are likely to experience elsewhere in the city.

  • Monitor sky brightness through the night, night-to-night, and year-to-year.

  • Determine which nights show the greatest promise for finding the 'faintest fuzzies'!

  • Calibrate the effect of sky brightness on qualitative measures such as the Bortle Scale.

  • Investigate how sky brightness correlates with the solar cycle and month-to-month sunspot activity.

  • Help provide local ground truth for future sky brightness prediction with the Clear Sky Clock.

  • CCD users can make a correlation between the Unihedron SQM reading and when the background reaches some ADC level.


  • Audible signal while measurement is in progress.

  • Sky brightness displayed in visual magnitudes per square arcsecond.

  • Infrared blocking filter restricts measurement to visual bandpass.

  • Temperature in both Celsius and Fahrenheit as well as model number and serial number can be displayed with different button press sequence.

  • Precision readings at even the darkest sites.

  • Power-saving features designed in for maximum battery life.

  • Reverse battery protection.


  • Operates from 9V battery (included).

  • Size: 3.8" x 2.4" x 1"

  • Maximum light sampling time: 80 seconds

  • Specifications are subject to change without notice.

Additional Information

Additional Information

Manufacturer Unihedron
Warranty 1 Year Warranty
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