Label Verify
Scan every freshly printed sleeve before probes are built — the one checkpoint where a bad barcode is free to fix. Pass = every label reads (issue GH #302 pilot: set target 10 and demand 100% first-read). Typing a serial + Enter works too (no scanner needed to exercise the page).
A bare serial loads its standard 50-block; for a CUSTOM batch (e.g. an 80-probe range) type its explicit range — this page can't see the probe_batches registry. Explicit range max 200. Progress persists per batch in this browser; the finished check is recorded on the batch itself with Record ✓ verified.