Knife electric sharpener
The electric sharpeners permit to sharpen knives and scissors without damage them. It's also possible to repair some tools such as screwdriver.
Contrary to a manual sharpening, the electric sharpening doesn't need to master a particular skill. Indeed with a manual sharpening it's common to damage the edge due to a bad inclination or a bad movement. With an electric sharpener you just have to let the appliance do to obtain a perfect sharpening.