in stock
in stock

Sky quality meter (lens version) with Ethernet connectivity

243,61 EUR
excl. VAT
excl. 4,65 € Shipping costs

SQM-LE front & back view
SQM-LE, front- and back view

SQM-LE scope of delivery
SQM-LE scope of delivery


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.

Note: The SQM-LE is intended for LAN remote control only; it does not have a display. For standalone use, we recommend the SQM or SQM-L.

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.
Open protocol

Ethernet connectivity
Included applications for reading data in Java, C, Perl, Python.
The Half Width Half Maximum (HWHM) of the angular sensitivity is ~10°. The Full Width Half Maximum (FWHM) is then ~20°. The sensitivity to a point source ~19° off-axis is a factor of 10 lower than on-axis. A point source ~20° and ~40° 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
SQM-LE users manual
CD with PDF manual and example software
6ft Ethernet cable (straight through for connection to hub/router)
6ft Ethernet crossover cable (for connection directly to PC)
Calibration sheet indicates unit MAC address, and calibration values

Useful links:

(These are external links. Teleskop-Service has no influence on and takes no response for their contents)

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Transport & Covers:
46,13 EUR*

Weatherproofing for the connected Sky Quality Meter

110,92 EUR*

Weatherproofing for the SQM-LE, incl. PoE adapter


E-Mail: info@teleskop-service.de • Phone: +49 (0)89-9922875-0
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