“DUO” means the riflescope features a multispectral functionality. i.e. the riflescope is able to produce digital or thermal image. Both images can be also seen at the same time using the PiP window: one image being on the main screen and the other in the PiP window.
The digital channel is intended only for the daytime use.
Please use the thermal channel in low light conditions or complete darkness.
No, IR Illuminators cannot be used with the Thermion DUO as the digital channel is only for the daytime use.
Please note that you need to zero the digital and thermal imaging channels separately. Please follow the instructions to do this.
If zeroing is not performed in one of the channels, you will not be able to hit the target.
No, the riflescope does not allow installing an external rangefinder. The riflescope features a stadiametric rangefinder which offers manual measurement of an approximate distance to an object. You may read more here.
When the illumination level goes down, riflescope’s digital channel will automatically switch to the black-and-white mode to reduce the level of color noise in the image. Please move the riflescope to a location with sufficient light level to have a color image again.
No, restoring a previous firmware version is not possible.
Please make sure that:
In the course of the calibration process the image freezes on the screen – this is normal and not a defect.
You are using the manual calibration mode without closing the lens cover.
Please make sure the lens cover is closed during calibration or switch to the automatic calibration mode if you do not want to close the cover.
No, a clicking sound is normal in the automatic and semiautomatic calibration modes.
You may switch to the manual calibration mode to avoid the sound. Remember to close the lens cover to make sure no ghost images appear on the display.
Calibration levels the background temperature of the microbolometer and eliminates image flaws (such as vertical stripes, ghost images of previous objects etc.).
Intervals between calibrations depend on operating time: the longer a thermal imager operates nonstop, the less frequently calibration is required.
Please note that a certain amount of non-functional pixels (max 0.5% of total quantity) is allowed by the sensor and is not considered a defect. You may try repairing the pixels using the respective menu item of your thermal imager. For details, please refer to the user manual.
Click here to view sample video instructions.
No. Defective pixel repair is only possible for the thermal channel.
Yes, you can use a car adapter featuring a 5V / 2A output.
The internal battery can be replaced only at the service center. Please contact your seller or national distributor to arrange return for repair.
No, Thermion DUO does not support a remote control.
To control the riflescope remotely, you may use Stream Vision App available on
Yes, user zeroing profiles are saved after a firmware update.
After zeroing the reticle may be slightly off the centre of the field of view which is normal and does not affect accuracy.
If the riflescope is installed properly on your rifle, and the mount is well fixed too, you may not need to move the reticle a lot, thus the reticle will stay very close to the centre.
Yes, user zeroing profiles are saved even if the battery is not installed in the riflescope for a long period of time.
When using digital zoom, image is cropped so resolution will become lower and the image will look not as clear as when using the base (optic magnification).
It's a peculiarity of digital zoom in all devices, and it's not a defect.
All Pulsar digital and thermal riflescopes feature a max. shock resistance of 6000 Joules.
Please check this value for your cartridges.
Yes, Thermion DUO can be used on air/pellet guns.
Please make sure you follow all installation instructions
Thermion DUO features a max. shock resistance of 6000 Joules.
Please check this value for your cartridges.
Thermal riflescopes are considered dual use items so they are export sensitive if exported outside EU.
Also it might be necessary to apply for import license if you are entering the destination country.
Please contact the customs service of the destination country to find out if any restrictions for the import of thermal devices as a personal belonging apply.
The gun is equipped with a compensator or silencer that radiates heat when fired.
It is recommended to raise the height of the riflescope to a level at which the flare is not visible.
After that, you will need to re-zero the riflescope.
from Yukon Group 2023