I bought the eyeclops a long time ago and it is so amazing! You do it on your TV, and it can magnify anything really, you put the eye part on whatever you want to see bigger. It is really powerful, you can see the "hairs" on a string. And since the image is projected through your TV it is really BIG and easy to determine what is what. It's also easy enough for a three year old to do, yet an older kid will still get lots of use out of it as well.
Both my daughters have brought it to school during various science units so they could see the cells of a plant, the grains of salt vs grains of sugar and during rock studies among other things.
This is a link, but it's pricey, wow, I paid about half that when it first came out, you would think the price would go down not up. http://www.amazon.com/EyeClops-Bionic-Eye-Multizoom-Green...
We have a TV that is only a year old and it works with that so I know the type of TV you have will not be an issue either.