What is the zero reading of a $50 - 75 m m$ micrometer?

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Solution

The outside micrometer's zero reading (minimum range) when measured with a $50 t o 75 m m$ micrometer is $50 m m .$
When the spindle and anvil of the micrometer screw gauge are brought together, the zero on the main scale should correspond to a zero on the circular scale.
However, if the two zeros do not coincide due to wear and tear or a manufacturing defect, the vernier is said to have zero error.
Zero errors are classified into two types.
Positive zero error occurs when the thimble scale's $' 0'$ marking is below the main scale's horizontal reference line.
Negative zero error occurs when the thimble scale's $' 0'$ marking is above the main scale's horizontal reference line.

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What is the zero reading of a 50-75mm micrometer?

What is the zero reading of a $50 - 75 m m$ micrometer?