STAEDTLER Academy Scale Ruler 30cm Brand_Black Widow They work great on blackboards

They work great on blackboards and whiteboards and can be easily removed with an ammonia-based cleanser (ex

Each pad contains 12 sheets

hand brushing or direct squeeze-bottle use

Once finished

Individually tested for quality – trusted by professional artists worldwide

STAEDTLER Academy Scale Ruler 30cm Brand_Black Widow They work great on blackboardsSTAEDTLER Academy Scale Ruler 30cm is made out of a clear durable plastic and is ideal for students. It provides a 1: 1, 1: 100, 1: 20 and 1: 200 ratio on the front and a 1: 25, 1: 250, 1: 50 and 1: 500 ratio on the back. STAEDTLER Academy Scale Ruler 30cm is commonly used for compiling technical drawings.