Screw in the inside piece of the peephole from the inside part of the door.ĭespite it being low tech, the peephole is a valuable added layer of residential safety and security for the occupants.Push the new peephole lens through the outside of the door.Clean the hole where the peephole was located.Use the screwdriver from the inside of the door to unscrew it. Which lens is used in spy holes on doors to check the visitors?Ĭonvex lens is used in spy holes on doors to check the visitors.
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