Handheld sky-quality meter Colouring and activity books Size Varies between 25–40 mm

Size Varies between 25–40 mm in diameter

its durable design ensures you always have a solution to shoo flies and insects away while allowing you to eat

Infrared blocking filter restricts measurement to visual bandpass

Sources and Suggested Reading

Just like humans

Handheld sky-quality meter Colouring and activity books Size Varies between 25–40 mmAn affordable meter for measuring sky brightness for astronomers! The sky quality meter measures the brightness of the night sky in magnitudes per square arcsecond. Unprecedented sensitivity in a handheld meter! Uses 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