Caliper: Vernier Trainer

Learn precise metric measuring

Only for iPhone

Free · In‑App Purchases

iPhone

Learn to read a metric vernier caliper with an interactive instrument. See where the moving zero sits, practise each new step, and build confidence before using a real caliper. CHOOSE HOW TO START Learn First guides you through the caliper basics in a short interactive tutorial. Already know the basics? Start Training takes you directly to your first free exercise. Open Help during practice to review the main scale, moving zero and vernier alignment. You can revisit Learn later. FIVE FREE EXERCISES Level 1 gives you five whole-millimetre exercises with feedback. After Level 1, you can choose Full Access to continue. KEEP LEARNING The guided course has 30 levels. Start with whole millimetres, then learn half-millimetre readings and finer 0.02 mm vernier steps. Checkpoints show your accuracy and time so you can improve. PRACTISE YOUR WAY Read measurements, set the jaws to a target, or try timed Speed challenges. Zoom and move the scale to inspect the markings. ONE PURCHASE FOR FULL ACCESS The tutorial and Level 1 are free. A single non-consumable in-app purchase unlocks Levels 2–30 and the Read, Set and Speed modes. No subscription or account is required. Restore Purchases is available in the app. Caliper is a training simulator; it does not measure physical objects with your phone.

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Improved Full Access purchase and restore reliability. Pending purchases are handled more accurately, and purchase issues are easier to diagnose. Existing access and progress remain available.

Version 1.0.7

The developer, Concept of Proof B.V., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Linked to You

    The following data may be collected but it is not linked to your identity:

    • Purchases
    • Identifiers
    • Usage Data

Privacy practices may vary, for example, based on the features you use or your age. Learn More

Accessibility

The developer has not yet indicated which accessibility features this app supports. Learn More

Information

Seller
Concept of Proof B.V.
Size
38.4 MB
Category
Education
Compatibility
Requires iOS 16.4 or later.
  • iPhone
    Requires iOS 16.4 or later.
Languages
English
Age Rating
4+
In-App Purchases
Yes
Copyright
© 2026 | Concept of Proof B.V.
  • Developer Website
  • Privacy Policy

    • More by Concept of Proof B.V.

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