# Scroll Caliper

> A vernier-caliper style measurement widget pinned to the edge of a scrollable container that visually measures the active section's pixel height and scroll percentage as you scroll.

- Author: [nikolas-sapa](https://21st.dev/@nikolas-sapa)
- Library: @ns-ui
- License: no-license
- Tags: Scroll, Hud, SVG
- Live preview: https://21st.dev/@nikolas-sapa/components/scroll-caliper

## Install

```bash
npx shadcn@latest add "https://21st.dev/r/nikolas-sapa/scroll-caliper?api_key=$API_KEY_21ST"
```

Requires a 21st API key (generate one at https://21st.dev/mcp) passed as `API_KEY_21ST`. Free accounts get a limited number of installs per day; unlimited on a paid plan — see https://21st.dev/pricing.

Full component directory: https://21st.dev/llms.txt · More like this: https://21st.dev/community/components/s/scroll.md