About this interactive tool
Designed for Postmark Shapes, this workspace helps you work through a specific task using your own measurements and observations.
Suggested measurements or materials: Postmark scan; diameter; date as printed
No registration, paid API, or server upload is required. Measurements, labels and notes are entered by you. Use your own judgment to check the results before applying them in real life.
Interactive workspace
Your result
Your work is stored only in this browser where supported. Clearing browser data removes saved work. Export a copy if you want to keep it.
Related forum areas
These forum subjects are relevant to this tool. Visit the community to browse discussions or ask a question.
This is a user-operated planning and record-keeping aid, not a measurement instrument or professional safety assessment. Results depend on the data you enter.