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 Ensure Safety : FirstZi SDS/MSDS

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Any other problem like could not tighten the screw

Add another metal wash behind the gasket

DURABLE SANDING BLOCK The sandpaper grit is premium silicon carbide that provides abrasion resistance

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 Ensure Safety : FirstZi SDS/MSDSPhysics 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