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September 15, 2018 02:30 pm PDT
Original Link: http://feeds.boingboing.net/~r/boingboing/iBag/~3/kWOgu9pKhFo/the-1-99-ruler-that-measures.html
The $1.99 ruler that measures pupillary distance (so you can order eyeglasses online)
The simple to use EyeQue PD ruler provides you the ability to measure pupillary distance. Pupillary distance (PD) is the distance measured in millimeters between the centers of the pupils of the eyes. The PD is required to order eyeglasses.
Original Link: http://feeds.boingboing.net/~r/boingboing/iBag/~3/kWOgu9pKhFo/the-1-99-ruler-that-measures.html
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