What are the advantages of using an electronic balance instead of a mechanical balance?

What are the advantages of using an electronic balance instead of a mechanical one? Why do you need to re-zero the electronic balance before using it?|||the advantages of using an electronic balance is that you get more accurate and instant results. in the other hand if you use a mechanical you are subject to the "human error" a. you mean reset it after you use. you have to reset it because it has a mechanism that display you answer and wont erase it until you the the computer on the mechanical balance to clear it self.|||speed is the main one