These distance sensors are pretty nice, but most are sold without a protective cover and the makeshift glass or tape covers I tried did interfere with the ranging to some extent. This could be okay with some recalibration of the distance measurements, although for cases of significant interference, e.g. thicker glass tested, the unit would no longer be able to do longer ranges > 1 meter at all. In the end I found this unit that is very affordable and comes with a nice cover that causes minimal interference.
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