# 📐 L2 Spec — Eddy-Current Testing (near-surface metallic defect detection) Mismatch-Only Spec
**ID:** `L2-114-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-114`](/artifact/l1/L1-114)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.5 · **Delta tier:** 5
> **⛓ On-chain block:** 41554202
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| H | px | 64 – 2048 |
| W | px | 64 – 2048 |
| F khz | kHz | 1 – 10000 |
| Snr db | dB | 0.0 – 40.0 |
| Probe tilt | — | 0.0 – 0.1 |
| Edge effect | — | 0.0 – 0.3 |
| Lift off mm | mm | 0.1 – 10.0 |
| Lift off variation | — | 0.0 – 0.5 |
| Conductivity variation | — | 0.0 – 0.3 |
## 2. Tolerance (ε)
**Type:** `fn`
```
18.0 + 0.3 * SNR_dB - 10.0 * lift_off_variation - 6.0 * conductivity_variation - 5.0 * probe_tilt / 0.1
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.5 |
| Delta tier | 5 |
## 4. Fingerprint
`b7a94e1f86201977b2c2cc75d1d16f80aac5e119fc6a71ee9816d9db0f639e16`
## 5. On-chain Registration
- **Chain hash:** `0x7e57c6af80ae6caa9d5796ba73319ca0ccef5287475873af78da03e732456908`
- **Chain tx hash:** `0x43d2fef268e28bc15b6ba9b47a2a1d378a2a587b4a45c5bc9985478f63c6682f`
- **Chain block:** `41554202`
---
## File Mapping
This bundle consists of: `L2-114-001.md`, `L2-114-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-114-001.md` | Source of truth — edit this | Human or LLM |
| `L2-114-001.json` | Structured metadata for the registry | LLM regenerates from the sections above |
**Prompt for your LLM after editing this Markdown:**
> Read the attached Markdown. Regenerate the sibling `.json` so every field matches.
> Preserve the schema documented in the rows above.
> Output each file in its own fenced code block tagged with the filename.
> Output only the JSON object.
_This Markdown was auto-synthesized from the catalog row for `L2-114-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._