ELNA XPRESSIVE 2 User Manual page 203

Here are two examples of density conversions:
Embroidery points to millimeters
1 pt = 0.1 mm
Embroidery points to stitches per inch
4 pt = 63.5 spi
If you have a Fill stitch with a density of 63.5 spi, the distance
between each thread is 4 pts. You adjust density according to the
fabric and the design's size. Generally, lighter fabrics and smaller
designs require fewer stitches.
ELNA XPRESSIVE II 201
User's Guide