Sky Quality Meters

The Boltwood Cloud Sensor II measures the amount of cloud cover by comparing the temperature of the sky to the ambient ground level temperature.

A battery powered cloud sensor, perfect for those expeditions to dark-sky sites and star parties!

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

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

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

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

An affordable meter for measuring sky brightness for astronomers!

An affordable meter for measuring sky brightness for astronomers!

Single button operation

This housing design is made to protect the SQM-LE/LU from normal outdoor conditions including weather and insects.

The Unihedron CapSelector provides an inexpensive way to tune a VLF loop over a wide range (120 - 5510 pF) of capacitances.

This adaptor kit was designed specifically for the SQM-L so that the battery compartment is accessible with the adaptor in place.

A standard diffraction grating used to separate white light into its spectrum.