Physics Optical Experiment Set Multifunction Reflector Refraction Triangular Prism Convex Lens Concave Mirror Dial Linear Light Source Teaching Demonstration Equipment for Teacher Student Education auspowers_batchtwo Add another metal wash behind

Add another metal wash behind the gasket

Neck and shoulders fatigue will be released

Any other problem like could not tighten the screw

form-fitting and lightweight

Physics Optical Experiment Set Multifunction Reflector Refraction Triangular Prism Convex Lens Concave Mirror Dial Linear Light Source Teaching Demonstration Equipment for Teacher Student Education auspowers_batchtwo Add another metal wash behindPhysics Optical Experiment Set Multifunction Reflector Refraction Triangular Prism Convex Lens Concave Mirror Dial Linear Light Source Teaching Demonstration Equipment for Teacher Student Education Specifications Material: acrylic Package Size: 24cm14cm2. 6cm(9. 455. 511. 02 inches) Batteries Needed: 2 pieces AAA batteries (NOT included for safety) Suitable for: Teacher junior high school students Optical Experiments: refraction of light, convex lens