The Floops Flox multi-tool wins the EGOT of the knitting world:
Stitch Marker! Cable needle! Stitch holder! Dropped stitch fixer! Small seam baster!
As traditional stitch markers they slip effortlessly from needle-to-needle. As locking/removable markers they slip easily into your stitch - you can even work it one-handed! No need to put down your project.