STABILO BOSS ORIGINAL

The fat, flat highlighter that has been on desks since 1971, and still the one to grab when a page needs to be scannable at a glance. One chisel tip gives two line widths, 2 and 5 mm, so the same pen covers a whole definition or underlines a single term. STABILO says it can sit uncapped for up to four hours without drying out, which suits long sessions where the cap keeps going missing. The ink is water-based, so test it over fresh ballpoint or gel ink before committing a whole textbook. It is refillable and comes in 9 fluorescent and 6 pastel colors, enough to give each topic its own shade.