really great lab markers, but not as ethanol resistant as some people say...and definitely not resistant to hexanes! but I love it for labelling tubes anyway..the labels are a nice dark black, not like transparent grey sharpie markings.

This pen/marker lives up to it's name of being able to write on just about any surface. Comparable to a Sharpie, i found that it wrote smoother and was easier to make fine lines thanks to the extra fine tip. I love this pen and would highly recommend it.

These are simply the best laboratory pens out there.

Dark vivid marking on polypropylene sample vials. Good alcohol resistance

I gave it to my boyfriend to test on lab tubes, and he said that it's perfect....then didn't give it back. So now I have to order more before I can try it out for myself!

Ethanol resistant, not completely immune to it. On rougher surfaces it holds really well. Smooth surfaces like petri dish or eppendorf tube side, not so well.

After the ink has dried properly, it's difficult to get it "accidentally" wiped out. You might smear gloves on the ink if working with a lot of ethanol.

I think it's one of the better ones if not the best lab markers I've used in a decade.

Bought it on a recommendation that it is good for laboratory use. It unfortunately cannot write on slightly wet tubes, the ink just doesn't stick, which sucks if you forget to label your things right away! Otherwise, the extra fine tip is perfect for writing on really tiny microcentrifuge tubes, glassware, tapes, and other plastics (as long as they are dry).

It also does not survive liquid autoclaving that well...

Best lab pens!

Very handy for permanent use on a bunch of different surfaces.

Very resistant to ethanol.