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I believe this is the best device that has come from China in over three years.  The SmokTech ZMAX is an adjustable voltage -or- adjustable wattage mod device.

This is the latest version which addresses the RMS or mean voltage calculations.

All of our ZMAX have blue displays.

The ZMAX is compatible with most any 510 threaded atomizer or cartomizer/tank system without the need for adapters. It will also thread eGo-T and eGo-C tank atomizers and our SmokTech eGo Dual Coil Cartomizers (Black and stainless) without an adapter. The clear eGo Dual Coils will require a 510 to eGo adapter.

Utilizing a single 18650 battery it is adjustable from 3 volts to 6 volts in .1 volt increments.

In wattage mode it is adjustable from 3 watts to 15 watts in .5 watt increments. The nice thing about the wattage mode is that you can put virtually any atomizer or cartomizer on the ZMAX, set your wattage, and the ZMAX figures out the needed voltage for you.

A maximum current output of 4 amps ensures that it will work with most any atomizer/cartomizer you can throw at it.

The ZMAX is available in stainless steel, chrome or black chrome finish.

Includes gift box, user manual and (1) ZMAX device in your choice of color. Photo shows two ZMAX, DCT tank and drip tip. You will only receive ONE ZMAX.

It does -not- come with batteries or a charger. We recommend the AW IMR 18650 orange batteries and the TrustFire single bay 18650 charger (Listed below). We have had hit and miss success using the Grey Panasonic batteries because the ZMAX cap doesn't want to go over the end of the battery. This is because the outer wrapper makes the diameter larger.

I run my ZMAX at 4 volts and it lasts me a good 14 hours before the battery needs charged.

Additional features:

510 and eGo compatible threading, including eGo-T/eGo-C atomizers, Vision clearomizers, etc
Check atomizer/cartomizer resistance
Check battery remaining power
Low battery indicator
Atomizer/cartomizer short circuit protection

To access the menu system simply press the activation button quickly 3 times, you will then be able to cycle the following menu by pressing the same button:

1. Uu  Adjust Voltage Up

2. Ud  Adjust Voltage Down

3. So  Standby (On/Off)

4. Uc  Check voltage of battery

5. Ds  Various Displays Sub-Menu

   Do  Display atomizer/cartomizer output voltage
   Du  Display battery output voltage
   Dr  Display atomizer/cartomizer resistance

6. LED On/Off

7. Voltage Power

   Po: Constant Power (wattage) operation
   Uo: Constant Voltage operation

8. Change voltage calculation method, RMS or mean calculation

In the event of a fault, the following error codes may appear on your ZMAX device:

LOR - Atomizer/cartomizer resistance is too low

LOU - Battery voltage is too low, replace or charge battery

WSC - Short circuit in faulty atomizer/cartomizer