The 12-pack value set includes 3 black markers, 1 red marker ... the Amazon Basics Low-Odor Chisel Tip Dry Erase White Board Marker, Assorted Colors – Pack of 12 is a great option.

If you’re carrying around an exposed circuit board and a bunch of wires people are going to notice you. But a dry erase marker won’t turn any heads. And this one holds its own little secret.