Favourites are listed first. Prices are without shipping and may include bulk offers.
Rotring 600 Ballpoint Pen (25.32€) with Ohto Flash Dry Gel refill 0.5mm (2.10€) (Parker G2 format = ISO 12757-1 G2). Full metal. In my opinion, this is the best gel pen you can get and assemble without custom tweaks.
Sharpie S-GEL 0.7mm (1.42€). Bit too thick, I’d prefer the 0.5mm which is not available in Germany. Smoothest pen I know.
Pentel BLN75-AO EnerGel 0.5 mm (1.23€). Best value for money gel pen that you can easily buy. Unfortunately its refill doesn’t fit into the Rotring 600.
Pilot Precise V5 0.5mm (0.95€)
Pilot G-Tec C4 Gel Micro 0.4mm (2.57€). Very thin.
Schneider Gelion 0.7mm (1.99€)
MUJI Gel Ink Ballpoint Pen (1.95€). Used this one all the time during university, but they changed the design and I don’t like it so much anymore. Better inks are available today.
Schneider Slider Rave XB (3.20€). Mix of gel and regular ballpoint ink. Quite thick lines. Very easy to find in Germany.
Ohto NBP-507R Promecha Needle Point 0.7mm (6.34€). Full metal. Doesn’t fit Ohto gel refills unfortunately.
(As listed above, I put a gel refill into my Rotring 600. The default ink is an atrocity.)
Rotring 600 Mechanical Pencil 0.5mm (15.96€). Full metal.
Pilot Super Grip H-185-SL-B 0.5mm (1.77€). Retractable tip and cheap, perfect on the go.
Pentel P205 0.5mm (7.07€ with 12 pencil leads)
LAMY Bleistift tipo AL (Model 139 Blue) 0.7mm (11.90€)
MUJI Rubber Mechanical Pencil 0.5mm (3.20€)
LAMY AL-star Silver (25€). Daily driver during school time.
Jinhao 992 (3.60€)