The distance measured is probably 0 units of measurement from the interior of the sensor! It does not use radiated or reflected spectral analysis. The wind screen is a good indicator that it needs gases to calmly waft by its “nose” to give accurate and steady measurements. This is all just intuited but I would also say that the fact that the pins are designed like transitor tubes of old, they have limited lifetimes and are meant to be easily replaced.
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