Great value for demonstrations and experiments
These electroscopes are well-built and large enough to be seen clearly at the back of a classroom. It's very easy to show electrostatic induction and conduction with them using any triboelectricity kit. I used these for two labs in my high school physics classes. The markings aren't totally clear, but the front is large enough to tape a large protractor to so students can measure deflection angles. A student accidentally dropped one (ugh) and the back broke cleanly into two pieces (no shards). Unfortunately, that also bent the electroscope needle somehow, and I couldn't get it to return to a 0-degree resting position. Otherwise, this is a very strong product, and when it's in stock again I'll be ordering another set.
