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The flatness of a machine bed can be measured using

1. Vernier calipers
2. Auto collimator
3. Height gauge
4. Tool maker's microscope

Correct answer: Auto collimator

Solution

An auto collimator is specifically designed to measure angular deviations and flatness with high precision by utilizing a collimated light beam, making it the most suitable option for assessing the flatness of a machine bed.

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