The ETA hand2mind (49778) Octave Tuning Forks provides students with hands-on experience with pitch and resonance, and are designed for classroom use. The set of 8 includes one tuning fork each of C-256 Hz, D-288 Hz, E-320 Hz, F-341.3 Hz, G-384 Hz, A-426.6 Hz, B-480 Hz, and C-512 Hz, a rubber-tipped mallet, and fabric-lined wooden storage box. Science education products incorporate applied math and science principles into classroom projects. Teachers in pre-K, elementary, and secondary classrooms use science education kits and products alongside science, technology, engineering, and math (STEM) curriculum to demonstrate STEM concepts and real-world applications through hands-on activities. Science education projects include a broad range of activities, such as practical experiments in engineering, aeronautics, robotics, energy, chemistry, physics, biology, and geology. ETA hand2mind develops educational and supplemental materials for teaching math, science, reading/language arts for pre-kindergarten through grade 12 students. The company, founded in 1968, is headquartered in Vernon Hills, IL.