Very Cool.
I wish Stuff like that was Available when I Switched. All we had was 98mAh
batteries and Attys that Held 9 Drops. LOL
Here is a Tip that you might find Helpful.
I find it hard to read the Numbers on the Dial/Body of my Twist/Spinner except in Very Good Light.
So what I did was to set the Wheel an my Average Voltage. Then I took a Jewelry File and made a Very Small Notch in the Wheel inline with the Power Button. A notch just big Enough to get my Thumb Nail into.
Now when I want to increase the Voltage, I just put my Thumb Nail into the Notch and turn it to the Right. To Lower the Voltage, turn it to the Left.
Makes it very Easy to adjust Voltage without having to be in Bright Light or eve looking at the Unit.