Unihedron Sky Quality Meter (SQM-LE) 20 Degree FIELD, Ethernet Connection $249.99,Free Shipping,  Unihedron SQM-LE,Telescope Accessories Accessories, Low Price
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Unihedron Sky Quality Meter (SQM-LE) 20 Degree FIELD, Ethernet Connection

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Unihedron Sky Quality Meter - LE SQM-LE

Item No. 787-11000
Manuf. No. Unihedron SQM-LE

Free Shipping (within the 48 contiguous US States only)

An ethernet-enabled SQM model for night-time sky brightness monitoring!

An affordable meter for continual, connected measuring of sky brightness for astronomers!

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

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 SQM reading and when the background reaches some ADC level.
  • Sky brightness reported in visual magnitudes per square arcsecond.
  • Infrared blocking filter restricts measurement to visual bandpass.
  • Sensor temperature, model number, and serial number are provided.
  • Precision readings at even the darkest sites.
  • Field-upgradeable firmware
  • Open protocol document
  • Ethernet connectivity
  • Included applications for reading data in Java, C, Perl, Python.
  • The Half Width Half Maximum (HWHM) of the angular sensitivity is ~10 degree. The Full Width Half Maximum (FWHM) is then ~20 degree. The sensitivity to a point source ~19 degree off-axis is a factor of 10 lower than on-axis. A point source ~20 degree and ~40 degree off-axis would register 3.0 and 5.0 magnitudes fainter, respectively.
  • Operates from 5-6VDC adapter (included).
  • Size 3.6 x 2.6 x 1.1 in.
  • Maximum light sampling time: 80 seconds.
  • Minimum light sampling time: 1 seconds.
  • Specifications are subject to change without notice.
What you get:
  • SQM-LE unit
  • Power adapter (120VAC input for North America customers, International adapter for everywhere else)
  • SQM-LE users manual
  • CD with PDF manual and example software
  • 6ft Ethernet cable
  • Calibration sheet indicates unit MAC address, and calibration values

Need Help? To Place an Order: Please Shop Online,
Visit Any Scope City Center or Call Us Directly at 1-800-235-3344

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return the merchandise in original condition within 15 days for a Full Refund, less shipping and handling charges!