I work in a laboratory that analyzes municipal water samples. I use this pen to write on wet sample bottles with no problem whatsoever. Recently we had a massive leak in the roof at the lab and many binders of handwritten data were soaked with water. It was interesting to see the ink of other pens running down the paper while the ink from the Power Tank was still intact and perfectly legible.

Such a great pen! the ink is very smooth, doesn't skip or blob. The feel of the pen in your hand is fantastic, it has a kind of grippy, controlled feel to it. The pen itself is a bit bulky, but that is really a benefit for me, having large hands. The retracting mechanism is probably the best out of all the pens i have, the spring mechanism has a very firm, efficient feel to it, and i have had absolutely no problems with it. When buying this pen, remember to load up on refills, you will not regret it! Trust me!

Nice sized grip; quite comfortable. Even ink flow. The pressurized cartridge is very important to me. I took off 1star for two reasons: My personal preference is for a little more heft and thickness in a pen barrel, and on garden variety tablet paper there is an occasional tiny "glop".

Excellent pen - dark black ink, good grip handle, retractable - click on/off, 1.0 mm point is medium, not too thick or thin; well-balanced pen.

This pen writes non stop anywhere. My favorite pen. I've had a dozen now and am now ordering refills too as the pen body lasts for more than one complete refill.

Better than excellent pen - the 1.0 mm pen tip is perfect!

For years the judges of our city's Christmas parade would have to put up with pens that would freeze up in the bitter cold. Our parade is at night, so it can really get chilly. I bought these pens hoping the hype about them not freezing was true. It IS true! The judges had no problems writing with them, even though their fingers were freezing cold. Glad I bought them!!

I really want to like this pen....But it writes cr*ppy, not badly, cr*ppy. Switched out the refill that came with the pen thinking maybe it was old....Nope, the replacement refill was nice for a day then the ink when back to skipping in every letter and the lettering too light. The cartridge replacement is horrible, you need to re-screw on the top multiple times to get the clip aligned properly, it's just clumsy and poorly designed...Avoid.

Very smooth to write. I feel that this color is more of a darkened black compared to other pens. Make my writing pop out more.

These pens are amazing! They never skip when you are writing and I love the fact that you tilt them up and they still write.