Review on 🔍 Diaphragm Double Slits with Varying Distances by Jeremy Choi

Scratching tiny, clean, parallel lines on a candle soot-covered glass slide is a headache, and the smaller and closer you want, the harder it is. They come with four different pairs and are almost perfect. Cons: American 3B Scientific takes a long time to reply to you when you order them. However, this is the only game in town and they really are top notch. It's worth the investment, but take very good care of it because replacing it will be a long and costly wait.