Least count - smallest measurement that an instrument can make, Least count of vernier callipers - 1 MSD / total no. of divisions on vernier scale, Least count of screw gauge - pitch / total no. of divisions on circular scale, Pitch - Linear distance moved for one complete rotation, 10 mm is the linear distance moved for 10 complete rotations. Pitch = - 1mm, Zero of vernier scale ahead of zero of main scale - positive zero error (vernier), zero of vernier scale behind zero of main scale - negative zero error (vernier), zero of vernier scale in line with zero of main scale - no zero error, zero of circular scale above the zero of linear scale - negative zero error (screw gauge), zero of circular scale below the zero of linear scale - positive zero error (screw gauge),

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