Toyota knit-tracer K33 assists machine-knitters with decreases and increases based on their calculated gauge. Refer to a manual (available online for free) for more details.

To the best of my knowledge, K33 fits only the bulky Toyota KS610 knitting machine. . Stay tuned as I am figuring out more details about this charting device, including compatibility with Toota knitting machines.

Other charting devices from Toyota are the K20, K31, K32, and K33A.