Big Time 12-Hour Demonstration Learning Clock diffraction & interference phenomena

diffraction & interference phenomena

featuring a hand-made design for educational study

and a storage box

can be measure AC / DC voltage

Physical Properties: Odorless white powder with a pH value of 12

Big Time 12-Hour Demonstration Learning Clock diffraction & interference phenomenaIdeal for hands on time practice. Helps kids learn to tell the time with ease. Ideal for an early introduction to time telling skills. Color coded hour and minute hands! Includes helpful teaching guide. Premium Quality: This item is made of high quality, heavy duty and durable materials. Designed for use in classrooms, household and educational settings. If you need custom order with different sizes design, please contact us. Safely Packaged to avoid