Caliper reads like an official cockpit systems sheet: matte graphite, broad black gutters, warm off-white inspection panels, hairline blue-white HUD geometry, and one safety-orange callout rail that joins a numbered chip to exactly the part it describes.
A small orange chip, an orthogonal 1px leader that bends at right angles, and the fragment it points at. It is how a maintenance manual labels a part — and it is the whole language at every scale.
A small orange tab marks the part; the number is the only label it needs.
A 1px orange line bends at right angles from the chip to the fragment — never a diagonal.
Pale HUD geometry frames the subject and stops before the corner closes.
The main plate stays silent; density lives only in the telemetry strips.
Three surfaces do the work: matte graphite shell, warm off-white inspection paper, and pale HUD glass — recoloured by role so a palette swap never breaks the instrument.
Ink-black gutters and matte graphite plates are the page itself, not a dark theme bolted on.
Warm off-white stock with hard black crop marks carries the long-form note, a guest on the shell.
Hairline blue-white brackets, reticles, and calibration ticks — never a saturated glow.