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You can also consider buying a FLIR ONE accessory for your Android or iOS device

i would no recommend them. They are ok but battery is empty pretty fast and the software is pure ... (why does it need GPS and Bluetooth on?).

The nice thing is that you can run them from desktop with tool https://source.dpin.de/nica/flir-gtk

How much do these go for?

The prices are on that page, from CAD$305 to CAD$689 depending on the model you want/need.