Get in touch
Contact us
One person maintains this site, and there is one way to reach them: email. There is no contact form, because a form would need a server to receive it and the whole site is deliberately static.
hello@digitalverniercaliper.com
Expect a reply within a few days. Messages that include a specific page URL and a clear description of what you saw get answered fastest — and, if it is a bug, fixed fastest.
What to write about
Any of these is welcome. The links open your mail app with the subject line already filled in, which just helps sort the inbox.
Something is wrong
A reading the simulator gives that a real caliper would not, a mistake in a worked example, or a broken control. Tell us your browser and device, and the least count and units you had selected — that combination is usually enough to reproduce it.
A feature request
A least count we do not offer, a caliper type we do not simulate, a language you need it in. No promises on timing, but requests that arrive more than once tend to get built.
Classroom and course use
You are welcome to use the simulator in lessons, labs, worksheets and course pages, and to link to it freely, without asking. Write only if you need something specific — an offline copy, a set of fixed practice readings, or written permission on file for your institution.
Anything else
Press and publishing enquiries, licensing, privacy questions, or a request to exercise your data rights under the privacy policy.
Before you write
Two things come up often enough to answer here.
"The caliper is not the right physical size."
It will not be, and it cannot reliably be. A browser has no dependable way to know your monitor's true pixel density, so the on-screen instrument is drawn at an approximate scale. It is a teaching tool for reading a scale, not a ruler — do not hold objects against your screen to measure them.
"My reading disagrees with the answer."
Check the zero error control first, then the least count. A reading taken with the wrong least count is out by a consistent factor, and a non-zero zero error shifts every result by the same amount. If both are as you expect and the numbers still disagree, that is a bug worth reporting — please include a screenshot.
Privacy of what you send
Email you send is stored in an ordinary mailbox and used only to answer you. It is not added to a mailing list and not passed to anyone else. Please do not send personal information beyond what your question actually needs. See the privacy policy for how long correspondence is kept and how to ask for it to be deleted.
Also on this site
About us
Why this simulator exists, how it is built, and what it is — and is not — meant to be used for.
Privacy policy
What the site stores on your device, what it does not collect, and which third parties are involved.
Terms & conditions
The terms you accept by using the simulator, including the accuracy disclaimer that matters most here.