Sonometer, Graduated Monochord

Comprises A Hollow Resonce Box With Three Adjustable Strings – Two Strings By Means Of Wrest Pin While Third One At The Center With Loads Or A Spring Balance. A 60Cm Scale Fixed On One Side Between Two Fixed Bridges Has Multi-Coloured Segments For Easy Reading, With Each Smallest Block Of 1Cm Provided With Two Movable Bridges To Change The Effective String Length. (Sonometer, Graduated Monochord)