Review on ๐ Optical Triangular Spectrum for Enhanced Physics Instruction by Rich Shankar
Good for science school lessons
The packaging was excellent as was the delivery time. The quality of the glass showed no defects. I took 2 stars off the rating just because I couldn't shine and display rainbows as wide as advertised and there were no instructions.
Pros
- Perfect for outdoor activities
Cons
- Poorly thought out
