Caliper: Vernier Trainer

LEARN TO READ A VERNIER CALIPER IN MM AND INCHES. Caliper: Vernier Trainer turns a mechanical vernier scale into short, visual exercises. Choose millimetres or inches, find the moving zero, read the main scale, match a vernier line, and put the measurement together. START FREE Try the guided introduction and Level 1 without an account. Each measurement system has its own course and saved progress. LEARN AT YOUR PACE Work through 30 levels in mm or a separate 30-level inch course. The metric vernier teaches readings down to 0.02 mm; the inch vernier teaches 0.025 in main-scale marks and 0.001 in readings. Practice reading and setting the caliper, then try timed Speed rounds. Progress and active rounds are saved on your device. CHALLENGE YOURSELF Explore Easy, Normal, Hard and Impossible Challenge worlds, each with 30 levels for each measurement system. The free Easy 01 round shares Level 1. Earn achievements as you improve. ONE-TIME FULL ACCESS Level 1 is free. One non-consumable in-app purchase unlocks Levels 2–30, additional Challenges, and Read, Set and Speed practice in both mm and inches. The App Store shows the price in your local currency. Restore a previous purchase in Settings. Choose light or dark appearance and one of 11 in-app languages. You can switch between mm and inches in Settings; each course keeps its own progress.