Manual Fish scalers are also useful but without a steady hand fish scaling process will not be easy. Whereas electric ones can effectively do its job, saving you time and effort in scaling the fish. There are also electric fish scalers that are wireless and with cords, depending on where and how often you intend to use the scaler. The only downside with electric fish scaler is that batteries can worn out anytime so you may need to replace it once in a while.