A damp hair needle swings across a ring of moss ticks. Hold to watch its settle; release to freeze where it stands. Closer to the bright tick keeps the gauge calm; wider landings count as large errors. Three wide drifts end the run. Spamming the release kicks the needle harder and makes the next settle less kind. Between ticks the moss stays quiet, so patience is part of the tool. Precision marks remain on this device. Set the needle down and the damp hair rests until you lift it again.