External micrometer screw gauge from Mitutoyo in its storage case.
Specifications:
• Measuring range: 0–25 mm
• Accuracy: 0.01 mm (shown on the drum)
Function:
It is used to very accurately measure external dimensions of objects, for example:
• Thickness of sheet metal or wire
• Diameter of cylinders or shafts
• Length of small details
Accessories:
• Ratchet wrench: used to adjust the zero point or calibrate the tool
• Reference rod (only sometimes with 0–25 mm): for checking measurement precision (does not seem necessary here as 0 is the natural reference)
Use:
1. Place the object between the measuring tips
2. Rotate the drum until you make contact with the object
3. Read the measurement of the sleeve and the drum together