SW-2454 - ESAW Graduated Monochord Sonometer 

For investing pitch of vibrating strings as a function of their tension, length, and thickness. Comprises a hollow resonance box with three adjustable strings – two strings by means of a wrest pin while the third one at the center with loads or a spring balance. A 60cm scale fixed on one side between two fixed bridges has multi-colored segments for easy reading, with each smallest block of 1cm. provided with two movable bridges to facilitate changing effective string length.