I find I am absolutely dependent on stitch markers when I do the Fair Isle pattern knitting. I mark out each pattern repeat by both width and depth. This keeps me on track and I don't muck up as often.
I have tried multiple different types of markers, from dangling things that I could wear as earrings to gadgets I found in the local hardware shop. Nothing was really satisfactory and I was about to give up when I found these. I've been using them for a while and they are very functional, do not get in the way, don't drag on the needles and don't distort the knitting.
These are a hard plastic and I use these the most frequently. I purchase them from Mel Clark, who co-authored the knitting book with Tracey Uhlmann:
These are the same sizes, come in different colours and are flexible but don't drag on the needles:
When I complete a pattern repeat, I like to mark it. In this way I can keep track of how many pattern repeats I've done which can be important when planning reductions for necks and armholes. I use these tiny latex rings. I knit them into the fabric and then cut them out after blocking.
I thought I'd share these knitting tools which are working well for me.