This ruler measures up to 30cm when extended but for measuring smaller items, it can be folded and used comfortably in its half size. You can even use
Midori Multi Ruler
Midori Compact CL Multi Ruler 30cm Clear (42237006) : Office Products
Doughnut Macaroon Tiny Crossbody Bag - Cream x Iceberg x Sakura
Produkter - Komadori
Designphil Multi Ruler 11.8 inches 30 cm Blue India
MIDORI 折疊式多功能尺規折尺(30cm)
Video - How to Make Habit Trackers You'll Actually Use
Midori Compact CL Multi Ruler 16/30/50cm, Plastic Foldable Transparent Ruler with Protractor for Student Examination and Drawing - AliExpress
These folding rulers fold down to half their size - just 15cm - and include a little protractor! , Size folded : 2.5cm x 15cm , Unfolded: 1.75 x 30
Midori Folding Multi Ruler
Midori - Komadori
Kuretake Zig Fudebiyori Brush Pen - 6 Color Set