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Uni-ball Signo RT UM-138 Gel Ink Pen - 0.38 mm - Black

by Uni
$1.65

Uni-ball Signo RT UM-138 Gel Ink Pen - 0.38 mm - Black - UNI UMN103.24
  • Uni-ball Signo RT UM-138 Gel Ink Pen - 0.38 mm - Black - UNI UMN103.24
  • Uni-ball Signo RT UM-138 Gel Ink Pen - 0.38 mm - Black - UNI UMN103.24
  • Uni-ball Signo RT UM-138 Gel Ink Pen - 0.38 mm - Black - UNI UMN103.24
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Uni Signo RT gel ink pens contain water-based pigment gel ink and feature a retractable 0.38 mm gel ink roller ball pen, rubber grip, and a steel point for strength.

Super practical and affordable, the Signo RT pens have been a long time tried and true favorite of JetPals.


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Frequently Bought Together
Uni-ball Signo RT UM-138 Gel Ink Pen - 0.38 mm - Black - UNI UMN103.24+Uni UMR-83 Gel Ink Pen Refill - 0.38 mm - Black - UNI UMR83.24
Total Price: $3.00
This item: Uni-ball Signo RT UM-138 Gel Ink Pen - 0.38 mm - Black - $1.65


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Specs
Model NumberUNI UMN103.24
Shipping Weight0.35 oz
Body Color Black
Body Material Plastic
Cartridge-Compatible Yes
Clip Material Plastic
Clippable Yes
Color Set No
Diameter - Grip 9.6 mm
Diameter - Max 10.6 mm
Grip Color Black
Grip Material Rubber
Ink Characteristics Waterproof
Length - Extended 13.8 cm
Length - Retracted 13.9 cm
Mechanism Retractable
Pre-Installed Ink Color Black
Tip Length 4.4 mm
Tip Material Metal
Tip Size 0.38 mm
Tip Type Conical

Reviews
5 people found this helpful
  While the 0.38mm tip..., June 8, 2011
By wao... - See all my reviews
While the 0.38mm tip writes fine lines, I am rather disappointed in the ink reservoir. If you pay close attention, the inner diameter on the refill is much smaller than most normal refillable pens which explains why these pens have such a short lifespan. The inner diameter on this refill is 2mm (approximately 3/32”) whereas other pens, like the Zebra Sarasa or the Uni-ball Signo 0.5mm, have a much wider inner diameter. These pens have a 5mm (approximately 5/32”) inner diameter, resulting in 2.5 times more ink than the Signo 0.38mm RT. It’s a great price, especially for those who love super fine tips. Me? I’ll take the extra ink with a 0.5mm tip.
3 people found this helpful
  To the guy who is complaining..., January 18, 2012
By ken.y.hua - See all my reviews
To the guy who is complaining about the reservoir size. It isn't that the .38 size has a smaller reservoir in particular, it's that the retractable signo's as a model have a smaller reservoir. Any size of signo DX models will have the same size reservoir. If you want .38 and still want a big reservoir go look at the .38 signo DXs. They also come in .28 and .5 btw. Anyways, the pen itself has been good to me as all the models of signo I've tried have been. Other than that sometimes not having to worry about a cap can be a good thing. Also, the grip is farther down the pen, which is better for me because I hold pens closer to the tip, which with the Signo DX model is pretty far up so I end up holding past the grip anyways.
  This is a good, smooth..., August 20, 2013
By brittanynoelle - See all my reviews
This is a good, smooth writing, precise pen. I will agree that the ink quantity is small and I used up each and every last bit of ink in these pens because I love writing with them. Especially in my lab notebook, since they're waterproof. When I resorted to a Pilot G-2 after this pen died the ink ran like crazy at the slightest drop of water.

It's a pity the refills for this pen are actually more expensive than the pen itself, or I'd just get the refills.

Either way, don't pretend that this pen will last forever and buy a good half dozen because you'll like it.
  Great retractable pen,..., April 28, 2013
Great retractable pen, the 0.38 line is more like a 0.5 line, which in my opinion is better. As most of the cases, the clip is very fragile, look for the Zebra Sarasa Clip or Pilot Juice, which have a metal mechanism for more versatility in the clip.
  Good pen for writing..., June 8, 2012
By grayandorange - See all my reviews
Good pen for writing English, Chinese or Japanese. Good control, smooth and even. Good price too.
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