The upgraded Atomizer Ohm Meter with a new cool function. It can test the voltage of an ecigarette battery with a Volt Test adapter (Voltage adapter for battery sold separately). Screw on the Volt Test adapter on the Meter, then screw on an eGo battery on the Volt Test adapter. Please turn on the battery and keep pressing the button on the battery. You will see the voltage on the meter's screen. The Volt Test adapter will be available soon. The Atomizer Ohm meter can test the resistance of an atomizer or a cartomizer. 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. Basic accuracy is about 2%. The Atomizer Ohm meter is simple and easy to use with native 510 and eGo connector. Requires two (2) 1.5 Volt AA batteries which are not included. DO NOT USE 14500 Li-ion or other 3.7 Volt Batteries as this can cause inconsistent readings. Unit:1pc Color: Black Threading:510/eGo Shipping package: Mini Paper Box Warranty:30 days from date of delivery.