This handheld device measures the darkness of the night sky and output a reliable value up to 21.5 mpsas (magnitude per square arc-second) .
As a standalone device, a rechargable battery is included to provide atleast 12 hours in continuous mode.
The device can also be connected to a pc using usb-usb mini cable and it is compatible with application like SQM reader pro and APT.
The built-in lens provides a 20° angle of measurement, offering the possibility to direct it only to some part of the sky.
Every device is calibrated so output data can be confronted with other SQM values.

Item size: 30 x 54 x 105 mm.