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OHTO MS01 Mechanical Pencil Review: Adjustable Guide Pipe

Writer: Riku Morihata
Riku Morihata
7 days ago
2 min read

​The OHTO MS01 is a 0.5 mm mechanical pencil built around one idea: you set it up the way you write. Instead of one fixed feel, you can change the guide-pipe length and the amount of lead advanced per click. Here is what that means in practice, and who it suits.

OHTO MS01 specs at a glance

  • Lead size: 0.5 mm

  • Color: Silver (model MS01-SP5-SV)

  • Length 151 mm; barrel diameter 10 mm (11 mm maximum)

  • Weight: 27 g

  • Materials: brass grip, dial and tip; aluminum knock cover; steel clip

  • Adjustable guide pipe and lead advance; removable clip; adjustable lead-grade indicator

What the adjustable guide pipe does

The guide pipe is the metal tube at the tip that supports the lead. A longer pipe exposes more of the point, which can help when you draft against a ruler or work on fine detail. A shorter pipe gives a more traditional pencil feel. Because the MS01 lets you adjust it, one pencil can cover both habits.

Adjustable lead advance per click

You can also choose how much lead comes out each time you press the knock. A short advance suits small handwriting and notes. A longer advance means fewer clicks when you sketch or write long passages.

Weight and build

At 27 g, with a brass grip, dial and tip, the MS01 is a solid, metal pencil. If you prefer very light pencils, compare it with a lighter model before you buy.

Removable clip and lead-grade indicator

The clip comes off if you want a clean barrel or do not want it catching on a pocket or pencil case. The adjustable lead-grade indicator lets you note which lead grade is loaded.

Who the OHTO MS01 is for

  • Drafting and drawing, where tip visibility matters

  • Anyone who writes small and wants control over lead length

  • People who like metal pencils with some weight

  • A gift for students, designers and stationery fans

How it compares

If you want a pencil that rotates the lead as you write, read our Uni Kuru Toga Metal review. If you prefer a wooden barrel, see our Pilot S20 review. The MS01 is the one to pick when adjustability is the priority.

FAQ

What lead size does the OHTO MS01 use?

This version uses 0.5 mm lead.

Can I remove the clip?

Yes. The clip is removable.

How heavy is it?

It weighs about 27 g.

What is it made from?

The grip, dial and tip are brass, the knock cover is aluminum and the clip is steel.

Shop the OHTO MS01 Mechanical Pencil in Silver at Marukaku.

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