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Similarly, you may ask, what is least count in vernier caliper?
The smallest value that can be measured bythemeasuring instrument is called its least count. AVernierscale on caliper may have a least countof 0.1 mmwhile a micrometer may have a least count of0.01mm.
Regarding this, how least count is calculated?
To get the least count of the mainscale,count the number of divisions on the main scale in onecm ofit. Divide 1 cm into that much number of divisions; thevalueobtained is the least count of the main scaleincm.
Micrometer screw gauge is an instrument usedtomeasure the diameter of thin wires, thickness of small sheetsofglass,plastic etc. It can measure up-to 1/10 of mm (or 0.01mm=0.001 cm) which is usually called the least countofMicrometer.