Least Count = Minimum size that can be measured with main scale alone(MSD) / the total number of divisions on vernier/circular scale(VSD). Thus in short-form, it can be written as, L.C.=MSD/VSD.

Least count of an instrument is one of the very important tools in order to get accurate readings of instruments like vernier caliper and screw gauge used in various experiments. Least count uncertainty is one of the sources of experimental error in measurements.

2. How to calculate least count of vernier caliper?

What is the SI unit of least count?

The least count of an instrument is the smallest measurement that can be taken accurately with it. The least count of meter scale is 1mm, and that of the ammeter shown below is 2 ampere.

The least count (LC) of the Vernier Calipers is known as vernier constant (VC). It is the difference between one main scale division and one vernier scale division, i.e VC=1MSD−1VSD.

Answer: It is a type of error in which an instrument gives a reading when the true reading at that time is zero. For example needle of ammeter failing to return to zero when no current flows through it.

Answer: (i) Pitch of a screw gauge – it is the distance moved by the screw through its axis along one complete rotation. (ii) Least count of a screw gauge – It is the distance moved by it in rotating the circular scale by one division.

You can read the main scale to the nearest tenth of a centimeter. The vernier consists of 50 divisions, meaning that 0.1 cm is divided into 50 parts and the final least count is 0.1 cm/50 = 0.002 cm = 1/50 mm.

Use the COUNT function to get the number of entries in a number field that is in a range or array of numbers. For example, you can enter the following formula to count the numbers in the range A1:A20: =COUNT(A1:A20). In this example, if five of the cells in the range contain numbers, the result is 5.

A variety of other types of micrometers also exist according to different measurement applications. Examples include inside micrometers, bore micrometers, tube micrometers, and depth micrometers.

A micron is a metric unit of measurement where one micron is equivalent to one one-thousandth of a millimetre [1 micron (1μ) = 1/1000 mm] or 1 micron (micrometer) = 1/1,000,000 of a metre.

For Micrometer there are 50 divisions on the circular scale and minimum division on the main scale counts 0.5mm. We can calculate by the above formula L.C = 0.5/50 = 0.01mm. Q.

End error in a meter bridge is an error brought on by the scale's zero changing at various positions as a result of the non-uniformity of the metal wire. The shifting of the scale's zero at various locations is referred to as end error.

On the Vernier caliper, the main (stationary) scale is divided in to millimeters. The Vernier (moveable) scale is 9 mm long and consists of 10 divisions. Each division on the Vernier scale, then, is 0.9 mm long, or 0.1 mm less than the main scale divisions.

A vernier scale, named after Pierre Vernier, is a visual aid to take an accurate measurement reading between two graduation markings on a linear scale by using mechanical interpolation, thereby increasing resolution and reducing measurement uncertainty by using vernier acuity to reduce human estimation error.

Vernier acuity measures the ability to detect a misalignment or positional offset between visual stimuli, for example between two vertical lines when reading a vernier scale.