I overlooked this statement:

The Pocket Spot Light Meter sub-ranges between 5 and 6 EV. This means that at less than about 6 EV, the meter changes from 1 degree to 3 degree reading. (To judge 3 degrees is the same as 1 degree, but use the thickness of the case. Remember that the actual spot is mostly square, not round as the site implies.)
Still don't understand...