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How durable is the PathFindIR II`s protective window?

The window used in the PathFindIR II enclosure is extremely durable. The window is 4mm thick, and is designed to withstand harsh environments. The window is relatively small, less than 1” in diameter, which helps limit the exposure to oncoming debris. The PathFindIR II also incorporates an automatic lens heater which activates at 4 degrees C, ensuring operability in cold climates.