Lumocolor Special F-Tip Foil Pen, 5 Waterproof Permanent Markers in Black, Line Width Approx. 0.6 mm

Bought these because the sharpies in my microbiology lab don't farewell in the autoclave or with EtOH. These are a bit pricey but are fantastic. Perfect size tip with which you can clearly write on tiny microcentrifuge tubes, falcon tubes and even glass tubes and bottles such as duran bottles and wheaton bottles. They fade a bit in autoclave tape (but all other markers do too) but still very legible. The back end is well sealed so if you have to spray them with EtOH for the MSC it won't ruin them, and even if you accidentally write on EtOH they still work after a few minutes. Experienced no fade in the -80C on plastic nor under UV in the MSC This is the second pack I bought.