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Micrometer Reading Trainer

Build confidence reading sleeve + thimble scales and applying zero-error correction under exam-style prompts.

  • Supports 2 curriculum editions
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Interactive stageMeasurement view

Loading the interactive model…The interactive model did not load. Try again reloads this page; the explanation and worked content here are still available.

Scroll within the diagram to inspect the scales. Full screen gives more room.

Read the instrument, commit an answer, then inspect the explanation.

Case Controls

Guided mode controls how much help you see. Question set controls whether zero-error correction is included.

Reading workflow (3 steps)
  1. Step 1: identify the sleeve reading at the thimble edge.
  2. Step 2: identify the thimble contribution at the datum line.
  3. Step 3: apply zero-error correction from the closed-jaw check if needed.

Shortcuts: Alt+Enter check, Alt+W working, Alt+N next.

mm
Study lensRead sleeve and thimble scales correctly for each case.12 min activity

Try this

Keep hints on for your first run, then retake without hints for exam pacing.

Learn to

  • Read sleeve and thimble scales correctly for each case.
  • Apply zero-error correction with the correct sign.
  • Explain each reading step using short working notes.

Exam transfer

  • Instrument reading
  • Zero-error practice

Governing idea

Reading = sleeve scale + thimble divisions × least count. For a 0.5 mm pitch and 50 divisions, the least count is 0.01 mm.

Model boundary

The model assumes correct ratchet pressure, no backlash, and a clean contact surface. Those effects can matter on a real micrometer.

Avoid this trap

Include a visible half-millimetre sleeve mark before adding the thimble reading; missing it shifts the answer by 0.50 mm.

How to explore

Train sleeve-thimble reading and zero-error correction in one focused session.

Predict the outcome, change one variable at a time, then interpret the result. Completion records participation only and does not award mastery.

About this activity

Build confidence reading sleeve + thimble scales and applying zero-error correction under exam-style prompts. A text explanation and no-JavaScript route remain available.

How this activity affects progress
Course and syllabus information
Course
GCE A-Level H2 Physics, SEC G3 Physics
Edition
GCE A-Level H2 Physics 2027, SEC G3 Physics 2027