Test cartomizers & atomizers without having to use a multi-meter! Screw on your cartomizer or atomizer and the tester will show you your ohms. Great for RBA users. The ohm meter will read a 1 in the first digit to the left if there is no current flow through the device. Accuracy is 0.005Ohm or 0.2%, whichever is greater. When the measurement is below 1.00Ohm, the meter will display mOhms, or 1/1000s of an Ohm, instead of Ohms. When displaying mOhms, the decimal point is not displayed. The meter is simple and very easy to use with native 510 and 901/808 connectors. The test amperage is only 6mA and will not produce heat at the coil of the atomizer or cartomizer you are testing. Comes packaged with 2x AA batteries and adapter (pictured).