Usage and limits
Dot spacing: 1–50mm; minimum margin: 5–50mm; diameter: 0.1–2mm and at most half the spacing. Only complete intervals are placed; spare space is split between margins, so actual margins can be larger. SVG retains millimetre dimensions as vectors. Choose the matching paper and 100% scale in print settings, with headers and footers off. Save PDF through the browser print dialog. On-screen preview size is not physical size; check the printed scale yourself.