If you want to upgrade any member of the InfiRay Tube thermal imaging scope family (V2) to a true rangefinder version, all you need is the InfiRay ILR-1200-1 laser rangefinder module.
In the menu of every Infiray Tube (V2) thermal imaging riflescope you will find the option to use the ILR-1200-1 laser rangefinder data when communicating via Bluetooth connection. Its eloquent model number also refers to the rangefinder's 1200 meter measuring range. The laser rangefinder can measure to an accuracy of +/- 1 metre at 100 metres. The laser's wavelength 900-908 nm is outside the visible range, so it is undetectable and does not alert game.
The included replaceable RCR123; 3.7-volt battery pack can run for up to 4 hours. As this is generally less than the operating time of the thermal camera scope, it is worth getting a spare battery/battery pack, although it is unlikely that you would want to use it continuously in parallel with the thermal camera.
Dimensions 95 x 92 x 85 mm, weight 170 g.