OK, I tend to want to adjust voltages by .1 off and on during the day, and/or as my eliquid thickens or my wicks start to clog. Even jumping by .2 can make flavor either disappear or go slightly burnt tasting.
Experimenting with an Ohms Law Calculator (nice, I used to have to do that all with my computer calculator!) I found that it takes .2 volts to change by .5 watts in the low voltages on a 2.2 coil. My Zmax mini will only adjust wattage in .5 watt increments, but will adjust voltage in .1 volt increments. (As the voltage gets higher compared to the resistance, a .1 change in volts becomes more significant, and once I was in the 4-volt range, .1 volts gave a .48 wattage difference.) So.....is .5 watts a standard increment in vw like .1 volts is in vv?