What are the classification methods of different particle size measurement benchmarks?

Measured parameter	Analytical Method	Particle Size Range（μm）
Length	optical microscope	>0.5 0.001～200
Length	electron microscope	>0.5 0.001～200
Cross-sectional area, surface area	optical microscope	>0.5
	electron microscope	0.001～200
	imager	>0.5
	sieving method	>3
	Light obscuration	0.003～100
	Disk centrifugal sedimentation method	0.02～30
	light blockage method	1～100
	Electromigration classification	0.005～1
volume ,mass	X-ray small Angle scattering method	0.003～0.5
	Laser particle size analyzer	0.05～8000
	gravity settling method	1～100
	resistivity method	0.5～100
	Dynamic light scattering method	0.003～10
	Diffusion cell	0.005～0.2
	Ultrasonic spectrum	0.01～100