This device is designed to test the resistance and voltage of vaping products.  The unit is very compact to allow for easy storage.  The unit is powered by 2 AA batteries that are not included.  The posts are eGo threaded, and there is an included connector to use them with 510 threaded devices.  The left post marked with a V is for measuring the voltage of batteries only, and the right post marked with a Ω is for measuring the resistance of Atomizers and Cartomizers only.  

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Features:
eGo and 510 Thread Compatible
Accurately Measures Voltage and Resistance
Compact Size

Specifications:
Range for Tested Resistance:  0.01Ω to 9.99Ω
Range for Tested Voltage:  0.01V to 9.99V
Operating Voltage:  2.2V to 5.5V
Working Current:  Less than 10mAh with no tested object; less than 30mAh with tesed object
Standby Power Consumption:  Less than 10uA

In The Box:
1 Meter Device
1 Connector (packaged in the battery compartment)

This device requires 2 AA batteries that are not included.