Not your regular problem periscope, but an increased ProtoScope for Rook. ProtoScope provides 3 diverse viewing conditions and can effortlessly attach on to merchandise (32415) for Greatest ProtoTool Method.
Not your standard issue periscope, but an enhanced Proto-Scope for Rook
Proto-Scope offers 3 different viewing selections
Attach onto the Proto-Tool (item 32415) for Ultimate Proto-Tool adventure