Reading a real tool correctly is its own skill, separate from the math behind it — a tape measure, a protractor, a caliper all fail you the same way if you can't actually read the marks. Start here to build tool literacy: what to reach for, how precise it actually is, and how to read it without guessing.
Read a real ruler down to the sixteenth of an inch. Learn why tick height tells you the fraction at a glance, then practice reading and placing real measurements — graded exactly, no partial credit for "close enough."
Read and place angles on a real protractor — and see the radian value sitting right behind every degree reading. Ties directly back to Calculator Explorer's π key instead of teaching π as a second, unrelated fact.
The real triangular drafting tool — three faces, six edges, eleven scale ratios from 3/32" to 3" per foot. Teaches the two skills that trip people up: picking the correct edge for a stated drawing scale, and reading the reversed-inch stub that sits to the left of zero on every edge.
Guess tomorrow's weather, then check how close you got — thermometers and pressure readings are measurement tools same as a ruler or a caliper. Locked as a genuine Weights & Measures module (not just a redirected card) — its progress now counts toward this hub same as Ruler and Protractor.
Three weighing mechanisms in one module — a digital load-cell readout, a spring-driven dial with dual kg/lb rings on one needle, and a balance beam you sum by hand. Digital tests real conversion since there's nothing else to read; Dial and Balance test the physical reading skill with metric shown alongside for exposure.
The flagship of this category — drag-to-length, offset measuring, the carpenter's 10-inch trick. Needs real drag interaction, not just click-to-place, so it's being built after Ruler Simulator proves the reading pattern out, not before.
Outside, inside, depth, and step measurement — the same tool reading four different features depending on which jaws you use. Digital, dial, and vernier variants planned.
Sleeve and thimble reading, with a digital readout available as a checking aid — not a replacement for learning to read the mechanical scale itself.
hil-shell.js or
session-logger.js yet — same gap Punctuation Explorer had before this session, and the same
porting work: mechanical at this point, not a design question. Scale Rule Simulator from the original
proposal isn't on this roadmap yet — it teaches a genuinely different skill (reading a scaled drawing, not
a physical tool) and deserves its own scoping pass rather than being assumed into this list.
WM_MODULE_IDS below, so its progress counts toward
this hub the same as Ruler and Protractor. Two things this does NOT resolve, left exactly as open as before:
(1) the moduleId string used below is a best guess from filename convention
(hil-weather-spotters) — unconfirmed against Weather Spotters' own actual
MODULE_MANIFEST.moduleId, verify before trusting the progress count; (2) whether its
badges (weather-watcher, junior-meteorologist, still defined in
hil-guild.html's catalog) get re-categorized as Weights & Measures badges is a separate
question this comment doesn't answer — say the word if you want that folded in too.