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Unihedron Sky Quality Meter


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Product Details


    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.


    OPT Product Number: UH-SQM 


  • specifications

    Warranty1 Year Warranty

Product Reviews

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    Thomas C.
    United States United States

    Unihedron Sky Quality Meter does what it is supposed to do

    I gave the Sky Meter a 4 of 5 due to the finicky way it takes to get the temperature readings, if not pushed just right, the readings only appear as Celsius. Otherwise, the unit is easy to use and has clear readings.