Every trade has a few tools so entrenched they've become the default: Mitutoyo calipers, the Shure SM57, a Cambro. This register writes that knowledge down: 465 entries across 45 trades, written, contested, and voted on by the people who use them. Open to read, invite-only to write. An entry becomes a Recognized Standard at +10, every entry starts at zero, so the first standards will be decided by whoever shows up. No sponsors, no affiliate links.