Ruler: Type and how to use? : r/whatisthisthing

Found this in my basement while cleaning up. Anyone have any Ideas

All Rulers Are Not Created Equal

what is this plastic clip thing? Ruler is in cm : r/whatisthisthing

Small black plastic item, domed one end with metal insert, hook

Found in a garden in Dunedin, NZ. What is this thing? Metal shaft

Westcott Flexible Typesetter's Ruler

Some type of ruler or measuring device with different numbers on

What is this brown ceramic type block, it measures 10cm by 5cm by

Thin pressed-steel tool. Length 11cm or 4.5 inches, weighs 15g

What are these tools/instruments for from 1772? Black bumpy

Ruler (cm) for scale. When shook makes a noise like it's filled