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Hand Punch photos and discussions
 

This is the back side of a Hand Punch reader, showing the components,
we were upgrading this one for a customer:

Hand Punch Size:  8.75 Wide, 11“ Tall, 9“ Deep (from the wall)

This is the actual laser “camera” that identifies the hand. 
It scatters with mirrors, then multiplies using computer imagery,
creating several thousand unique points of reference.