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Sky Quality Meters

Sky Quality Meter comparison

Model

SQM

Interface Handheld model [SQM]
Handheld / Display
Handheld model [SQM-L]
Handheld / Display
Ethernet model [SQM-LE]
Ethernet
USB model [SQM-LU]
USB
USB datalogging model [SQM-LU-DL]
USB
RS232 model [SQM-LR]
RS232
FOV

Wide

Narrow

Narrow

Narrow

Narrow

Narrow
Reach

Handheld

Handheld

Global

5m (15')

Autonomous

100m (300')
Readings
Single reading

Single reading

Single / Continuous

Single /Continuous

Single /Continuous

Single /Continuous




Field of view (FOV):

It is desirable to have a narrow field of view when determining the sky brightness in crowded areas where street lamps, buildings, trees, etc. are present. A more accurate view of a small area of the sky can be found with a narrow FOV. Here is the FOV comparison chart from experimental readings. Here is a visual FOV comparison chart.

The wide FOV meter is best suited in wide open areas where there is a clear view of the night sky.

In some wildlife studies where a creature is affected by the whole sky, the wide angle model may be more suited for single readings. Multiple readings using the narrow FOV unit can be combined for the same effect.

Products

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Unihedron Sky Quality Meter with Lens (SQM-L)

 

An affordable meter for measuring sky brightness for astronomers!

The "Sky Quality Meter - L" 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


Our price: $139.95 (€121.76)
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Unihedron Sky Quality Meter - LU-DL

A USB enabled data-logging light meter for night-time sky brightness monitoring!

An affordable meter for continual, connected or autonomous data-logging to measure sky brightness for astronomers and light pollution investigators.

The "Sky Quality Meter - LU-DL" (SQM-LU-DL) measures the brightness of the night sky in magnitudes per square arcsecond.

Designed by Dr. Doug Welch and Anthony Tekatch


Our price: $249.95 (€217.46)
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Unihedron Sky Quality Meter - USB

 

A USB SQM model for night-time sky brightness monitoring!

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

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

Designed by Dr. Doug Welch and Anthony Tekatch


Our price: $189.95 (€165.26)
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Unihedron Ethernet Enabled Sky Quality Meter

* The Unihedron SQM-LE Sky Quality Meter gives sky brightness reported in visual magnitudes per square arcsecond. * Infrared blocking filter restricts measurement to visual bandpass. * The Unihedron SQM-LE Sky Quality Meter provides precision readings at even the darkest sites. * Field-upgradeable firmware and open protocol document.


Our price: $249.95 (€217.46)
Quantity
Unihedron Sky Quality Meter - LR

 

An RS232 SQM model for night-time sky brightness monitoring!

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

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

Designed by Dr. Doug Welch and Anthony Tekatch


Our price: $189.95 (€165.26)
Quantity
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