Eisco Labs - Demonstration Electroscope - Detect & Measure Static Electric Charge - 10.6" x 6.3" x 4.7" - Science Experiment Tool for Physics, Chemistry, and Educational Use

Works well. Great for experiments.

I was satisfied with the purchase. The electroscope is very sensitive and retains the charge for quite a long time. However I would like to send a recommendation to the seller. It could be better if they put inside the packing box some kind of paper or foam so the disassembled electroscope does not move when moving the enclosing box. I was afraid before opening the package because when I took the box everything inside moved and I thought it could bend or damage some parts, specially the delicate needle that rotates. The little ball arrived with some imperfections and 4 holes on the surface.

Very useful for understanding and experimenting with electric charge and the photelectric effect.

I bought all three electroscopes on amazon and this is by far the easiest and most useful. The other two both require you to mount a thin strip that is used as the indicator, and in both cases mounting this strip is a big hassle and the resulting assembly does not work very well. This scope works out of the box, and works perfectly. The readings are sensitive and reproducible.

My only complaint is that the manufacturer directly markets to teachers, and so the version that I received came with no instructions, and the manufacturer wouldn't even let me download a pdf copy of the instructions unless I proved to them that I was a teacher. Knuckle-head company, but it's a good product. Thankfully there is so much material online for how these things work, it was no problem.

I can charge it the normal way with rods and cloth but it seems it should beable to charge with a power supply but I get 0V across the device. I probably have to sand it or something but instructions would be nice. I hear that they only give instructions to teachers which is absurd.

Not the best, but not awful. Good visual for students when it's working properly.

It works very well and because of its design it is much more responsive and linear than most electroscope designs. I therefore attached a suitably sized protractor to mine to make it into a quantitative instrument.