I have a generic brand (RainyB) angle finder from Amazon that needed a Gridfinity holder.  It will accommodate an angle finder that is less than 37mm wide and less than 250mm long. 

It uses a 2-wide by 7-long Gridfinity bin because the angle finder was just large enough NOT to fit into a single row.  I may move the angle finder pocket over and add another tool at some point, to make better use of the space.