# Scalebar Calibrate

> Calibrates magnification and pixel size against certified cross-grating standards, producing a drift-corrected calibration record suitable for audit trails.

- Skill: `emskills-mcp/scalebar-calibrate` (Agent Skill, multi-file: 7 files)
- Install (CLI): `npx skillmds@latest add emskills-mcp/scalebar-calibrate`
- Raw SKILL.md: https://api.skillmd.com/api/skills/emskills-mcp/scalebar-calibrate/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Security
- License: MIT
- Author: emskills-mcp (https://skillmd.com/u/emskills-mcp)
- Updated: 2026-09-22
- Page: https://skillmd.com/skills/emskills-mcp/scalebar-calibrate

---


# scalebar-calibrate

## Scope
Calibrates magnification and pixel size against certified cross-grating standards, producing a drift-corrected calibration record suitable for audit trails.

Expects standard SEM data products (image stacks, spectra or session
directories as appropriate) with pixel size / dispersion recorded in the file
metadata. Out of scope: acquisition scheduling, sample preparation, and any
analysis outside the calibration stage of the workflow.

## Safety
Read-only — no instrument control. The skill reads data from disk and returns results; it never moves the stage, changes dose, or alters column settings.

## Usage
```json
{
  "tool": "calibrate_scale",
  "arguments": {
    "input": "/data/sem/session-001",
    "output": "/data/sem/session-001/calibrate_scale"
  }
}
```

Returns a JSON object with `ok`, a `result` payload carrying the primary
measurement or map, and `diagnostics` with per-item confidence. Units are SI
unless stated otherwise in the result schema.

## Reproducibility
Runtime: `node 20`. Pin dependencies in `requirements.txt` / `package.json`
and run with a fixed seed. Reviewers can reproduce the reported numbers with:

```bash
cd skills/scalebar-calibrate
npm install && node verify.js --fixture fixtures/sample --seed 0
```