Edding 3000 4-3000-1-1001 Permanent marker Black waterproof: Yes

The ink of the permanent marker is perfect for high demands: It is very fast drying, light-resistant, smudge-proof and waterproof. These markers are great for writing, marking, painting and labelling almost all kinds of material including metal, glass and plastic. This model comes with a conical plastic tip and is very useful for preparing circuit boards, especially where thicker conductor tracks and ground surfaces are required.

Price: £ 3.29 from Conrad Electronic