Toyota knit-tracer K33A assists machine-knitters with decreases and increases based on their calculated gauge. Refer to a manual (available online for free) for more details.

According to some web sources, the K33A knit tracer K33A fits a wide variety of Toyota machines: bulky KS610 and KS650, and standard-gauge models KS777, KS858, KS895, KS901 and KS950. K33A knit tracer even fits Elna EK2400, which is similar to the Toyota KS950 model.

Stay tuned as I am scouting for pictures.

Other charting devices from Toyota are the K20, K31, K32, and K33.