Kniterate works with the ‘Nm’ yarn count system. Yarns suitable for Kniterate range from Nm6 to Nm 8, which includes Nm12/2, Nm14/2, Nm15/2, Nm28/4 etc. These are ideal for a 7gg look and feel of the fabric. Much thicker yarn would be problematic as it can cause broken needles. Thinner yarn can break more easily and creates a looser fabric.
Any yarn used on Kniterate is recommended to be at least double spun, which means the yarn consists of two separately spun yarns that are spun together. This technique makes the yarn much stronger than single spun yarn. This means that a Nm12/2 is a better choice than a Nm6 for example.
If the yarn count of your yarn is too low to knit with Kniterate, it is possible to ply the yarn. For example you can knit two ends of Nm28/2 and thread them in one pathway. When plating you are also knitting with two ends of yarn, which together should be between Nm6 and Nm8.