The stylus is the “Jot Touch” by Adonit. They carry several different versions, but each one has a clear tip so you can easily see where you are writing. I’ve found the accuracy to be very good, and I’d recommend it.
You can get one via my amazon link below, or watch a video review I did of an earlier model to see how it works. They have options ranging from $30 to $90, with features like pressure sensitivity, stylus+ink pen, or plain stylus. Check the description on the pressure sensitive options, as they have different generations that are compatible with various devices.
Happy (digital) drawing!