We can hear the protests already. “Why would I use an electric eraser when my regular eraser is working just fine? What could an electrical eraser possibly do that my putty eraser can’t?!”. The electric eraser is the tool that you think you don’t need until you start using one, and then you can’t imagine your life without it. Think of it less as a mistake-reverser and more like a tool of its own. http://www.tianhongstationery.com/electric-eraser/