The best way to test juices is to use an atomizer and an empty cartridge or drip tip. Blow out the atty, add about 4 drops of the juice you want to try right on the atty bridge, then put the empty cartridge on it and puff away. If you want to try a little more simply take off the cart and add 3 more drops and repeat the process. If you don't have an empty cartridge, you can simply use some tweezers and take the stuffing out of one. Hope that helps.