アイガーツール(Eiger Tool) Eiger tool (EIGER TOOL) Hobby.SL Hobby Selection Card Calipers TYK-10

The world's thinnest card size verns. [Use] Card Size: Verdigis Features: Sized to fit in your wallet or personal notebook A variety of functions such as measuring outer diameter and length, measuring the depth of the dent, measuring from the edge to the edge. (From Amazon.co.jp)