Piano Keyboard Ruler - Musical Note Reference Tool for Students & Teachers #1973390 (License: Personal Use)

This 30 cm transparent acrylic ruler combines standard metric measurement with a detailed piano keyboard diagram, including white and black keys labeled with note names (A-G) and corresponding MIDI note numbers. Designed for music educators and learners, it supports interval recognition, scale construction, and staff notation alignment. Its durable, non-slip surface makes it ideal for use on sheet music, keyboards, or digital tablets.

Used in music classrooms, private lessons, composition studios, and online learning platforms; targets users seeking visual aids for understanding pitch relationships, finger placement, or transposition-especially beginners and intermediate students.