Easily test cartomizers and atomizers without having to use a meter. Simply screw on a cartomizer or atomizer and this tester will show you the ohms. Great for testing ohms or for bad cartomizers or atomizers. The ohm meter will read a 1 in the first digit to the left if there is no current flow through the device. Accurate to +-0.2%. Will read from 0.01 to 9.99 ohms. Simple and easy to use with native 510 and 901/808 connectors.