Scanning electron microscope image showing sand particles. The individual parameters mean: HV is the accelerating voltage the value of which was 7 kV (it is the highest possible accelerating voltage that does not cause contamination for a given sample), mag is the image magnification, HFW is the horizontal field width, WD is the distance between the lens and the sample (working distance), det ETD is the ETD detector recording the secondary electron signal, pressure in the chamber, mode SE is the operating mode, using a detector recording secondary electrons.