A good mechanical pencil is a precision instrument. The body lasts decades with normal use. The only consumables are lead refills (€3 to €5 for a lifetime supply) and erasers. These three are the standards in architecture, design, and serious writing.
Rotring 600 (€35)
The Rotring 600 is the benchmark for all-metal mechanical pencils. Full brass body, knurled grip, hexagonal barrel that does not roll off a desk, and a lead hardness indicator. Available in 0.35, 0.5, and 0.7 mm. The construction is intentionally over-engineered: there are no moving parts that wear out beyond the lead advance mechanism, which is replaceable. It is the pencil architects and designers point to when asked what they use. The weight (28 grams) suits extended writing sessions better than lighter plastic alternatives.
Staedtler 925 25 (€20)
The Staedtler 925 25 is the professional alternative to the Rotring at a lower price. Metal body, knurled grip, pocket clip, and a lead grade window. The construction is slightly less premium than the Rotring (the tip section has more plastic components) but the writing experience is comparable. For students and those who want a durable metal pencil without the Rotring price, the 925 25 is the right choice.
Pentel GraphGear 1000 (€15)
The Pentel GraphGear 1000 has the best retractable tip mechanism of any mechanical pencil: the tip retracts when you press a button, protecting it in a bag or pocket. The body is partly metal, partly plastic. The 0.5 mm version is the most popular. For everyday carry and anyone who stores their pencil loose in a bag, the retractable tip alone makes it worth considering.
The Recommendation
For a lifetime desk pencil used for drawing, architecture, or serious writing: Rotring 600 in 0.5 mm. For a durable metal pencil at a lower price: Staedtler 925 25. For everyday carry with tip protection: Pentel GraphGear 1000. All three are refillable indefinitely with standard 0.5 mm lead.
