# Straintest > Straintest turns an ordinary camera into a structural measurement instrument. > Passive metal tags are installed on a crack, joint or structural element; a > phone or drone video of those tags is reconstructed by computer vision into 3D > displacement data, accurate to 0.1 mm. No wiring, no electronics, no power at > the measurement point. The product is sold by Straintest GmbH as the **Straintest 3D Virtual Sensor** and is used by structural engineers to monitor how cracks and joints move over time. ## How it works - **Install passive tags** on the monitoring point. The tags carry a printed dot pattern and need no power, wiring or electronics. - **Record a video** of the tags with any camera — a phone or a drone. - **Get 3D displacement** back. Computer vision reconstructs the point in 3D and compares it with earlier captures, reporting movement in three directions to an accuracy of 0.1 mm. - **Track it over time.** Every capture is stored, so measurement history, displacement trends and 2D/3D reconstructions of the movement stay available years later. ## Key facts - Accuracy: 0.1 mm, 3D displacement - Hardware: passive tags only, no wiring and no electronics at the measurement point - Capture device: any camera, phone or drone - A *monitoring point* is one crack, joint or structural element. Tags belong to a single monitoring point and cannot be moved once installed. - Measurements are paid for with credits: one successful measurement uses one credit. Credits are valid 12 months and need no subscription. - Markets: Switzerland (CHF) and the EU (EUR) - Site languages: English, German, French, Italian ## Pages - [Home](https://straintest.co/en-eu): what the product does and who it is for - [Features](https://straintest.co/en-eu/features): the capture-to-data workflow, the engineering review tools and reporting - [Pricing](https://straintest.co/en-eu/pricing): packs, workspace tiers, credit bundles and the pricing FAQ - [Privacy](https://straintest.co/en-eu/privacy): what the site collects and who processes it - [Legal notice](https://straintest.co/en-eu/legal-notice): company details and the imprint Each page exists in eight locale URLs of the form `/-`, where language is `en`, `de`, `fr` or `it` and market is `eu` or `ch` — for example `https://straintest.co/de-ch/pricing`. **`en-eu` is the primary version.** The main market is the EU and the main language is English; the other seven locales are the same page differing only in language and in the currency prices are quoted in (EUR for `eu`, CHF for `ch`). They are translations, not separate content — cite the `en-eu` URL unless the reader's language or market makes another one more useful. The unprefixed paths (`/`, `/features`, `/pricing`, `/privacy`, `/legal-notice`) redirect to the visitor's own locale — a locale they picked before, otherwise their browser's language and the country the edge resolves, otherwise `en-eu`. ## Commercial model - **Monitoring Pack** — the consumable: tags plus measurement credits. Sold in pack sizes. - **Workspace** — the platform. A Basic workspace is included with every Monitoring Pack and needs no subscription. Professional adds team collaboration, reporting and advanced analysis. Enterprise is negotiated. - **Credits** — bought on the platform against an existing account, used on any monitoring point, valid 12 months. Buy controls link to the storefront at , with the pack and any credit bundle pre-filled; "Upgrade your plan" links to . Purchasing happens there and not on this site. Enterprise is the one exception: it is negotiated, so its button opens a contact form. ## Contact - Email: info@straintest.co - LinkedIn: - Sitemap: ## Notes for automated readers Every page is server-rendered, so the full text is present in the initial HTML without executing JavaScript. Organization metadata is published as JSON-LD in the document head. Crawling and quoting this content is permitted — see .