Thermal imaging camera Keiler-2

Indicates whether it is a:
1. Binocular - for both eyes
2. Monocular - for one eye

The first number in the model number represents the magnification. It specifies how much larger an object appears compared to when viewed with the naked eye.

Digital night vision devices use a different technology, which makes the devices much cheaper.

The visible field in meters, that can be seen from a distance of 100 meters. This information is often more easily visualised as an angular specification.