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How Accurate Are Online Virtual Rulers for Measuring Small Objects?

Hi folks,

Hey everyone, I’ve been experimenting with some digital measuring tools lately and came across the term virtual ruler. I’m curious about how accurate these tools are, especially for measuring smaller items like coins or screws on a screen. Has anyone here tested the precision of a virtual ruler compared to a real one? Are there any browser-based tools or apps you’d recommend that are known for their reliability? I’m hoping to use one for quick measurements without always grabbing a physical ruler. Looking forward to your insights and suggestions. Thanks in advance!