On the Provari what you set is what you get! I own a bunch of devices that are similar to the features and functions of the Provari but they do not perform as accurately as the Provari with regards to the set voltage and actual resistance of the atty. Build quality is another huge factor that sets the Provari apart from the competition.
vape On!
The Provari uses PWM (pulse width modulation) but you can screw on an inline 510 digital voltmeter and read the voltage with the atomizer screwed onto the end of the voltmeter. If I set it at 4.0v, I get 3.99v on my DVM. I get that, even if I change to a 1.5 ohm coil. It can provide the amperage you need and it regulates the same voltage with the entire range of cartos that I have. That's the secret behind the consistency of the vape that people talk about.