# Caliper: Vernier Trainer — Learn precise metric measuring

> Learn precise metric measuring (iPhone/iPad app by Concept of Proof B.V..)

- Source: https://appshunter.io/ios/app/caliper-vernier-trainer/id6816234993 (this page in markdown: same URL + `.md`)
- Developer: [Concept of Proof B.V.](https://appshunter.io/developer/1818652911)
- Category: Education, Reference
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 16.4 · 36 MB
- Languages: American English
- Released: 2026-10-05
- Data updated: 2026-10-09
- User reviews in markdown: https://appshunter.io/ios/app/caliper-vernier-trainer/id6816234993/reviews.md

## What is Caliper?

Learn how to read a metric 0.02 mm vernier caliper, one step at a time. Practice on an interactive instrument, understand how the scales line up, and build confidence before using a real caliper.

UNDERSTAND THE READING
Find the vernier zero, read the whole millimetres, identify the matching line and calculate the final measurement. Follow the guided introduction, then apply the method yourself.

BUILD YOUR SKILLS
Progress through 30 short levels covering reading, precision, setting measurements and timed challenges.

PRACTICE THREE WAYS
• Read: identify the measurement shown on the scale.
• Set: move the jaw to a target measurement, with fine adjustments in 0.02 mm steps.
• Speed: work through 10 timed challenges and review your accuracy, response time and best streak.

SEE THE DETAILS
Zoom in and move around the scale to inspect its markings. Use Fit Whole Scale to return to the complete view.

START FREE
The guided introduction and first five levels are free. A single in-app purchase unlocks levels 6–30 and unlimited Read, Set and Speed practice. No subscription or account required.

Designed for students, apprentices and anyone learning to use a metric vernier caliper. This is a training simulator; it does not measure physical objects with your phone.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Caliper Full Access | $2.99 | one-time |



## Version history (last 2 releases)

### 1.0.1 — 2026-10-08

Caliper Full access and minor improvements

### 1.0 — 2026-10-06

No release notes.

## Apps similar to Caliper

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Stats & Probability Calculator](https://appshunter.io/ios/app/stats-and-probability-calculator/id6748586083) | — | Free | Education |
| [JLPT Test Prep: N5 to N1](https://appshunter.io/ios/app/jlpt-test-prep-n5-to-n1/id1668978191) | 5.0 (1) | Free | Education |
| [Kanji Memory Hint 2  English](https://appshunter.io/ios/app/kanji-memory-hint-2-english/id1199696428) | 3.5 (2) | Free | Education |
| [Kanji Memory Hint 3  English](https://appshunter.io/ios/app/kanji-memory-hint-3-english/id1401093144) | 5.0 (1) | Free | Education |
| [Probability Distribution](https://appshunter.io/ios/app/probability-distribution/id6447695305) | 4.5 (15) | Free | Education |
| [Aksaraya - Aksara Jawa](https://appshunter.io/ios/app/aksaraya-aksara-jawa/id1536319329) | 5.0 (1) | Free | Education |

## More apps by Concept of Proof B.V.

- [Vloep](https://appshunter.io/ios/app/vloep/id6746816250)
- [CraveCut: 90-Day Reset](https://appshunter.io/ios/app/cravecut-90-day-reset/id6762009356)

All apps by Concept of Proof B.V.: https://appshunter.io/developer/1818652911

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-09.*