Calibrate shows every well as a ring so you can line the grid up to a real plate. Lock hides all settings so nothing drifts mid-run — long-press the "platelight" label to unlock.
Pitch = centre-to-centre gap. Nudge origin + pitch until the rings sit dead under your wells, then it's fixed for this holder.
Dot lights under the well (clear plates); ring lights the rim (white plates). Crosshair draws guide lines to the target well; border adds a labelled A–H / 1–12 frame. Stack them freely.
No wells given → labels drop into wells in fill order. Blank → every well, in order.
0 wells logged.
Snapshots calibration, colour, overlays and thickness as your default, to restore any time. Your last-used settings are also remembered automatically.