In general, the more expensive the model, the sharper the image. A comparison table between the various models of Flir cameras is below. Note that we only carry the iOS version.

FLIR ONE CAMERA MODEL INFRARED LIGHT CAMERA RESOLUTION VIVIDIR IMAGE ENHANCEMENT MEASURABLE TEMPERATURE RANGE RUGGED ENCLOSURE PRICE
FLIR ONE Pro Gen 3 160 x 120 pixels Yes –4 to 752°F (–20 to 400°C) Yes $449
FLIR ONE Pro LT 80 x 60 pixels Yes –4 to 248°F (–20 to 120°C) Yes $354
FLIR ONE Gen 3 80 x 60 pixels No –4 to 248°F (–20 to 120°C) No $229

See Also:
FLIR ONE Thermal Imaging Camera and Thermal Analysis App Troubleshooting and FAQs