Description
Uniball Power Tank Pen, The Ultimate Outdoor Pen
This power tank pen is fantastic for the Emergency Services, Military, Mountain Rescue, Coast Guard, Teachers, DoE and those who work outside or take part in leisure pursuits such as orienteering, geocaching, mountain biking and hill walking.
Traditionally pens have been notoriously difficult to use in the often damp, cold outdoors environment with many opting for pencils or chinagraph pencils, this pen now offers a better alternative. The Power Tank pen writes in extreme conditions including wet surfaces, cold temperatures, and even upside down. Normal pens utilize gravity to create ink flow onto a paper, but the Uni-Ball Power Tank utilizes internal compressed air pressure to push out ink onto the paper. The pen can write on wet paper and be used in sub zero environments. The oil based pigment ink is high density and comes out smooth and dark on paper. The pen also features a finely texturized grip composed of 0.16mm slits so that it not only fits comfortably in your hands but is also hard to slip away.
We at Shaven Raspberry have used this pen outdoors in damp and cold conditions and can confirm it does perform well and can recommend it.
- The Ability to write in bad weather conditions
- Cold resistant ink that will not freeze in temeratures down to -20degC
- Will work on damp paper
- Will write upside down or at any angle
- Transparent ink cartridge so ink consumption can be monitored
- Comfortable grip ideal for cold fingers
- Writes in zero gravity (so the manufacturer claims, Shaven Raspberry has not been able to confirm this – yet!)
- Ideal for completing casualty cards, incident reports or taking contemporaneous notes
- Will happily write on wet Aqua 3 laminated maps


Paul Williams –
The power tank pen are great to use whether wet or dry. They work on all surfaces and in all directions. Paul Scouter
Joe Woodcock –
Second order for this pen. They are brilliant pens to use, super smooth and writes at any angle in sun and rain. First class service from Shaven Raspberry as always
Mark Evans –
These really are excellent pens. As a field naturalist, I am making notes all the time and in all weather conditions, and I still haven’t met a situation when these pens won’t write. I have in in each each of my jackets and have just bought another for my camera bag. A real plus point, as far as I am concerned is that they take refills and always carry one of those too.
If I have a criticism, it is the colour. Being someone with an highly developed talent for dropping things in the field, I would prefer a really bright colour, to make finding them easier.
paul welch –
These are without doubt the best pens for outdoor use you could buy.
I however agree with the last review, having a talent for dropping pens myself they are nearly impossible to find in grass etc. Nice bright colours would give you half a chance of finding a wandering pen.
A consideration would to to attach them to your jacket or rucksack using some of our hi-viz paracord!
Paul Williams –
great product. very good price
zack –
Excellent speedy delivery and product. Really does write on wet paper. Would highly recommend
James –
Brilliant cost-effective alternative to the fisher space pens – these are much better and I am amazed I haven’t found them before now!
Scott Shortland –
Does the job – got a few. Good price.
Bryan –
Somewhat Shavenraspberry has put life into me again with good quality pens, I have learned how to read a compass again with the paper map.
So thank you so very much for getting me outdoors again and loving it.
James A Robinson –
I have received the waterproof notepad but I am still waiting on the pen to be delivered, therefore obviously I have not used the notepad.
Apologies James, our mistake we missed the pen from your order, we are only human and sometimes get things wrong! The missing pen has been shipped first Class with Royal Mail! Thanks for bringing this to our attention.
Jim Robinson –
Thank you the replacement pen Shaven Raspberry, yes I agree “things can go wrong” but you’ve (Scott) put it right, good product and I will return for more.
Regards & thanks again.
Jim Robinson
Paul Williams –
Great pens used in wet conditions also great for writing at any angle.