Reading measurement scales

你需要知道的

• Read the main scale first: it shows whole millimetres at the zero mark.
• Work out what one small division is worth; on this caliper each vernier mark is 0.02 mm.
• Find the vernier mark that lines up best with the main scale and add that value to the whole millimetres.
• Practise with worked readings such as 5.72 mm and 16.2 mm, checking which side of halfway the pointer sits.

这个短片讲了

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