Particle size determination by optical microscopy

In this method a compound microscope is used, Inspect particles for their size and shape directly through a microscope. The particle can be measured using this method from 0.2 μm to 100μm in size range. The particle dimension is measured directly by seeming in the microscope or by the projection for a better view. 

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The principle of Particle Size Analysis
Methods of Particle Size Analysis
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Particle size determination by sieving method
Advantages and Disadvantages of sieving method in Particle Sizing
Particle size determination by Sedimentation method
Particle Size Determination by Laser Diffraction Method
Particle size determination by Coulter counters
Particle Size Distribution by Sieve Analysis