String Waves Apparatus Products Category : Physics, Energy > Physical Instruments, Experiment INQUIRY Details AC power source on 220V 50Hz or 110V 60Hz, display made up of three high-brightness LED, 1-300Hz adjustment range, amplitude and frequency are adjustable, with a adjustable 120cm-scale, and a movable pulley. Send Inquiry Name:* E-mail:* Tel: Content:* Verification Code:* (All * must be filled in) [ Previous: ] [ Next: ] Related Products Resistance Box Mighty Electromagnet Laser Distance Hair Wave Tank The Current and The Magnetic Field Sonic Generator Gay–Lussac law Demonstrator Electric Current Scale,Precise