Unihedron Sky Quality Meter

Brand: Unihedron


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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

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