I wanted an electric device with which I can sharpen knives sharp and was quite disappointed with this device. It has been to detect a slight, very slight sharpening effect, but this occurred only in 2 of 9 meters, which I have tried to raise. I have the electronic knife sharpening then abandoned and am changed to the manual. But I bought for a fraction of the money that "sharpening set for knives / corundum Whetstone + leather + lapping paste" and can achieve very good results in all diameters!
