Product Description - The TrackIR Series of thermal imaging monocular features a 400x300 17μm <50m - K NETD thermal sensor & image enhancement for performance imaging combined with a 50Hz refresh rate and a 1280x960 HD LCOS display resulting in a smooth & crisp viewing experience. The TrackIR 25 has a native magnification of 1.7x, with a digital zoom of 4x, resulting in a 6.8x total magnification which alongside the units long distance detection (Humans: 700m, Vehicles: 1700m) makes this unit perfect as a thermal spotter. - Features a built-in stadiametric rangefinder for measuring the distance of known objects as well as Picture-in-Picture (Pi - P) mode which adds a zoomed-in display-box within the main viewfinder, this allows the user to hone-in on their subject whilst maintaining full awareness of the wider field of view.