measuring instruments (precision)

Question

Which instrument generally offers highest precision for small lengths?

RankGuru · Accepted Answer

1. **Precision comparison**: Precision is limited by the instrument's least count (smallest graduation).
2. **Typical Least Counts**:
   - Meter Scale: $1$ mm ($0.1$ cm)
   - Vernier Caliper: $0.1$ mm ($0.01$ cm)
   - Screw Gauge: $0.01$ mm ($0.001$ cm)
3. **Analysis**: The **Screw Gauge** has the smallest least count, meaning it can distinguish between much smaller variations in length.
4. **Conclusion**: Therefore, it offers the **highest precision** for measuring thin wires or plates.

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measuring instruments (precision)

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