Answer:
Step-by-step explanation:
To adjust the zero position of the datum line on the sleeve scale of a micrometer, you typically need a specialized spanner called a micrometer spanner or micrometer wrench. It is specifically designed to fit the adjustment screws or locking mechanisms present on the micrometer sleeve.
Micrometer spanners are usually small, thin, and have a specific shape to match the screw heads or locking mechanisms on the micrometer. The exact design of the spanner can vary depending on the specific brand and model of the micrometer.
It's important to use the correct size and type of spanner recommended by the micrometer manufacturer to avoid damaging the micrometer or affecting its accuracy. If you don't have the appropriate spanner or are unsure about the adjustment procedure, it's advisable to consult the micrometer's user manual or contact the manufacturer for guidance.