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Unihedron Sky Quality Meter with Lens (SQM-L)

Brand: Unihedron

SKU : UH-SQM-L

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  • An affordable meter for measuring sky brightness!
  • Unprecedented sensitivity in a handheld meter!
  • Measures the brightness of the night sky in magnitudes per square arcsecond.
  • Designed by Dr. Doug Welch and Anthony Tekatch.

 

Product Details

  • The Sky Quality Meter-L measures how clear the night or site is. Compare the sky brightness at different sites with measured results! If you're a CCD use, you can make a correlation between the Unihedron SQM-L reading and when the background reaches some ADC level.

    How to Use the Sky Quality Meter-L

    • Keep track of the evolution of light pollution in your area.
    • Set planetarium dome illumination to mimic the skies you are likely to experience elsewhere in the city.
    • Monitor sky brightness through the night, night-to-night, and year-to-year.
    • Determine which nights are the greatest for finding the faintest of lights.
    • 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.

    Features of the Sky Quality Meter-L

    • Receive audible signals while measurement is in progress.
    • The sky brightness measure is displayed in visual magnitudes per square arcsecond.
    • Its infrared blocking filter restricts measurement to its visual bandpass.
    • Temperature is measured in both Celsius and Fahrenheit.
    • The model number and serial number can be displayed with different button press sequences.
    • Receive precision readings at even the darkest sites.
    • Its power-saving features provide maximum battery life.
    • Reverse battery protection.

      Full List of Specifications for the Sky Quality Meter-L

      • The Half-Width Half Maximum (HWHM) of the angular sensitivity is ~10 degrees.
      • The Full-Width Half Maximum (FWHM) is then ~20 degrees.
      • The sensitivity to a point source ~19 degrees off-axis is a factor of 10 lower than on-axis. A point source ~20 degrees and ~40 degrees off-axis would register 3.0 and 5.0 magnitudes fainter, respectively.
      • Operates from 9V battery (included).
      • Size: 3.6 x 2.6 x 1.1 inches
      • Maximum light sampling time: 80 seconds
      • Specifications are subject to change without notice.

      OPT Product Number: UH-SQM-L 

       

    • specifications

      Warranty1 Year Warranty
    • included items

      • An affordable meter for measuring sky brightness!
      • Unprecedented sensitivity in a handheld meter!
      • Measures the brightness of the night sky in magnitudes per square arcsecond.
      • Designed by Dr. Doug Welch and Anthony Tekatch.

       

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