I heard that an atomizer is where you put just a few drops in and vape and so on. I am looking for one so I can use it as a tester for my new flavors, but I don't know which one to buy and if it has a coil. I saw some that said rebuildable coil and I really don't want to build a coil. Can someone help me find an atomizer that has one in it and explain how it works. thank you.