The standard weight of a cricket ball used in professional matches ranges between 155.9 grams (5.5 ounces) and 163 grams (5.75 ounces).
This weight is mandated by the International Cricket Council (ICC) for international matches and is consistent across all game formats.
Microscope Diopter
This is a simple turning device which is either attached to the outside of an eyepiece tube of a binocular head, or to the eyepiece itself. When the diopter is turned, it raises or lowers the eyepiece to adjust the focus for each eye.