With the Sky Quality Meter, you can also get an accurate picture of the level of light pollution affecting your observing sites and how it is changing.
Often, amateur astronomers are unwittingly only able to determine the "quality" of a particular observing site subjectively. The current physiological state of the observer prevents an objective assessment, which is why instrumental monitoring is important, not only to help us choose the most suitable observing sites, but also to track changes and trends in sky quality over time.
The Sky Quality meter (L) version has a built-in objective lens that refines the measurement to a narrower 20° angle range, which can be read from the clearly visible digital display, but you can also read not only the sky quality but also the current ambient temperature in °C or °F. The measurement, which starts at the touch of a button, lasts about 8 seconds, which, repeated a few times, gives even more accurate readings, because as engineers say, "a measurement is not a measurement".
Accurate: - Do not point the instrument towards the Sun!