This is the standard thread found on most Rotary and Dumpy (Optical) Levels and some larger Cross Line Lasers. 
Please note: The style of the tripod head may vary, but the photo is really intended to illustrate the central thread size only.

This is the standard thread found on some of the smaller Cross Line Lasers and is the usually used on all photographic equipment.
Please note: The style of the tripod head may vary, but the photo is really intended to illustrate the central thread size only.