Unihedron Sky Quality Meter-L

Put a number on how dark the sky really is.

Aim the meter at a patch of night sky and press the button. A red number measures the brightness above you in magnitudes per square arcsecond. Try the same patch from a streetlamp and then from a dark field to see what your eyes have been adjusting to.

Independently selected
By Unihedron
Check compatibility and shipping with the retailer

View on Amazon

Another unexpected find

Photo by Lamiot · Source · CC BY-SA 3.0. Photo: Lamiot / Wikimedia Commons (CC BY-SA 3.0). Proportionally resized and converted to WebP. Full composition retained.

WHY IT CAUGHT OUR EYE

It turns a familiar argument between stargazers into an observation you can write down and repeat next month.

BEFORE YOU BUY

Point the lens away from nearby lights and obstructions. Moonlight and clouds affect the reading. The number in the photograph is an example.

Handheld, battery-powered SQM-L with the narrow-field lens and red readout.