The fonts included in this package produce X dimension at 10 mils (1/1000th inch, or 0.0254 cm) and heights at 1/8"(XXS), 1/4"(XS), 3/8"(S), 1/2"(M), 5/8"(T), 3/4"(XT) and 1"(XXT) respectively when printed at 12 points. To have the human readable printed beneath the barcode, use the human readable version which has a trailing capital A in the typeface name. Thus, MRV Code39MA prints code39 barcodes at 1/2" hight and 10mils as X dimension, with human readable text beneath the barcode.

To simplify the size calculation, X dimension is independent of the typeface. All fonts produce barcodes with identical X dimension under the same font size. To determine the typeface and font size, first calculate the font size from X-dimension requirement, then select a typeface which closest matches the required height.

The scalable fonts in this pakcage have different characteristics from the ones in Morovia Code39 Fontware 4.0 and earlier. Therefore you should not use this manual as a reference for Code39 Fontware.