Interactive precision measurement trainer
A Vernier caliper is a precision measuring instrument used to measure linear dimensions — outer diameter, inner diameter, length, and depth — with high accuracy. This free online Vernier caliper simulator supports three precision settings: 0.02 mm least count (50-division Vernier), 0.05 mm least count (20-division), and 0.1 mm least count (10-division).
Step 1 — Main Scale Reading (MSR): Read the last whole millimetre mark to the left of the Vernier zero line on the main scale. Step 2 — Vernier Scale Reading (VSR): Find which Vernier graduation aligns exactly with a main scale line. Note that division number. Step 3 — Total Reading (TR): Apply the formula TR = MSR + (VSR × LC) where LC is the least count.
The least count (LC) is the smallest measurement value the instrument can reliably indicate. A 50-division Vernier scale gives 0.02 mm; a 20-division gives 0.05 mm; a 10-division gives 0.1 mm. This simulator lets you switch between all three.
Key parts: fixed jaw (main scale), sliding jaw (Vernier scale), depth rod, locking screw, and fine-adjustment roller. Outside jaws measure external dimensions; inside jaws measure bores and slots; the depth rod measures step heights and hole depths.
This tool is ideal for TVET students, engineering diploma candidates, machinists in training, and secondary school science learners who need to practise Vernier caliper reading before practical assessments, final exams, or workshop evaluations.