The Tankometer is a handy gadget for testing the battery and output voltage of your ecig/mod, Made by UK Mod Maker deejay.
It has 510 connections on the top and bottom. Simply screw it on toyour device and press fire, it will display the voltage of your batteries,or if it's a variable voltage mod it will show exactly what voltage it is outputting. You can then put an atomizer on top of The Tankometer to display the voltage 'under load'. Simply screw/unscrew your atty to compare the voltage drop you are getting.
You can see your voltage under-load while you vape! A great accessory!
Update: Tested on the eGo Twist and works perfectly.
Note: The Tankometer works with almost all 3.7v mods (too many to list in full). It also works with most VV mods including the The Zolt, Ipro, Buzz Pro. It will not work with The Touchwood and a few other mods which the battery is placed upside down. It also will not work with a small minority of mods which use pulse width modulation (PWM) such as Joye eGo's & The Evo. If you are unsure if it will work with your device please ask.