Does anyone know the difference between the SM4B and M4B

I ordered both and the only difference I have found is the SM4B has cheaper packaging. The SM4B comes with a simple cardboard backed print package, covered in a stiff plastic, glued to the cardboard. The M4B comes with a nicer black cardboard box. The Pens themselves are identical as far as I can tell. Both are metal construction with nice clips in matte black.

Does it write in the rain?

According to Fisher Space Pen, their Sealed Pressurized Ink Cartridge "Writes under water", Performs in temperatures from -30ºF to +250ºF, in zero gravity, at any angle–even upside down!

http://www.amazon.com/Refills-Bullet-Fisher-Space-SPR4/dp/B004HGDQQS/ref=sr_1_2?s=office-products&ie=UTF8&qid=1393804261&sr=1-2&keywords=space+pen+refill

Would two of these easily fit into the pen slot on a police uniform left breast pocket? What about a snugger 5.11 Class B breast pocket?

Might be a smidge tight, but two will fit in my uniform pocket. I carry one of these in my shirt and a Fisher X-Mark in my pants pocket as a spare. A bullet pen would work in the pocket, too, but get a clip for it. Otherwise, it will roll off the hood of the squad and your partner will step on it. They're practically indestructible, but the pavement scars them and they look like hell after that. Be careful out there.

NonReflective Military Cap-O-Matic Matte Black (SM4B)

Product ID: 253936367

Details

Age range (description)
All Ages
Brand
Fisher Space
Colour
Matte Black
Ink colour
Black
Writing instrument form
Ballpoint Pen

🌊Waterproof & reliable underwater

🖊️Writes at any angle, even upside down

❄️🔥Operates in extreme temps -30°F to 250°F

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€ 53.85

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Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🖤 Write Boldly, Anywhere — The Pen That Defies Limits

WRITES ANYWHERE ANYTIME - From zero gravity to underwater missions, this pen conquers every surface and angle.
MATTE BLACK STEALTH FINISH - Non-reflective, military-grade matte black coating for a professional, tactical edge.
TRUSTED BY PROS EXPLORERS - Join astronauts, engineers, and adventurers who rely on Fisher’s legendary durability and performance.
EXTREME TEMPERATURE ENDURANCE - Reliable ink flow from Arctic chills to desert heat, ensuring your ideas never freeze or burn out.
ONE HAND ACTIVATION ZERO HASSLE - Effortlessly deploy your pen with a sleek snap-cap design built for speed and precision.

The Fisher Space Pen Cap-O-Matic Matte Black (SM4B) is a rugged, military-grade ballpoint pen engineered to write flawlessly at any angle, underwater, and in extreme temperatures ranging from -30°F to 250°F. Featuring a stealthy non-reflective matte black finish and one-hand snap activation, it’s trusted by astronauts, military personnel, and professionals worldwide for unmatched reliability and performance.

Specifications

ASIN	B001NXDFC8
Additional Features	Pocket Clip, Pre-Sharpened, Waterproof
Age Range Description	All Ages
Animal Theme	no animal theme
Best Sellers Rank	#42,255 in Office Products ( See Top 100 in Office Products ) #1,010 in Retractable Ballpoint Pens
Body Shape	[B]arreled
Brand Name	Fisher Space Pen
Closure Type	Snap
Color	Matte Black
Customer Reviews	4.6 4.6 out of 5 stars (2,195)
Drill Point	Medium
Global Trade Identification Number	00747609542417
Grip Type	Ergonomic grip
Hand Orientation	Ambidextrous
Hardness	B
Included Components	Fisher Pressurized PR4 Black Ink Medium Point, Gift Box (Gift Box)
Ink Base	Water
Ink Color	Black
Item Diameter	0.5 Inches
Item Dimensions	13.3 x 1.3 x 1.3 centimeters
Item Type Name	Stick
Item Weight	0.01 Ounces
Line Size	0.5mm
Manufacturer	Fisher Space Pen
Material Type	Brass
Model Name	Cap-O-Matic
Model Number	SM4B
Recommended Uses For Product	Writing
Style	Modern
Subject Character	Space
Theme	Space
UPC	747609542417
Unit Count	1 Count
Water Resistance Level	Water Resistant
Writing Instrument Form	Ballpoint Pen

Reviews

M**S

Work pen.

11.07.2019

Y**G

Aucune faute pour ce stylo qui écrit sans fautes, obéissant, glissant sans tâche, régulier et inspirant, idéal pour la création !

29.11.2017

R**Z

Excelente produto! Vale a pena o investimento!

1.10.2024

J**E

Sehr gut und Stabil und sofort brauchbar

20.08.2025

C**N

Es una pluma que trabaja excelente, promete lo que promociona, lo único queno fue muy de mi agrado podría ser la sencillez del diseño, pero es de saber que su fuerte es la tinta y en eso no hay absolutamente ninguna queja

9.09.2018

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