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The small black diamonds, or triangles (diamonds are more commonly found), on the top scale of the tape measure starting at 19.2 inches are for truss layouts for 8-foot sheet goods. They are also known as the black truss markings. They provide a quick visual for the tape user and speed up the measuring process.
Measure the width: Hold a tape-measure or a measuring stick along the shorter inner side of the box. Press the tip of the measure into one corner of the box, then stretch the tape across the short side to the adjacent corner. If the box is rectangular, you can assume that the other short side is the same length.