Catalogue record · hackernews
Free online ruler tool to measure anything on your screen with pixel-perfect accuracy. Calibrate with auto-detect, screen diagonal, or credit card. Supports cm, mm, inches, and pixels.
Online Ruler 可以在屏幕上测量任何东西，支持像素、厘米、毫米、英寸，可以用自动检测、屏幕对角线、信用卡校准。
Seen on hackernews · last checked 2026-10-25.
The teardown — how it actually charges, which mechanism was found, and the seam worth taking — is in the daily letter. This page carries the record and the signals so search engines and link previews have something real to read; the judgement stays with the readers who asked for it.
Get the daily letterThe same record sits in the full catalogue, where every entry can be searched and filtered by the signals above.