I'm pretty sure I saw that exact meter, was thinking about putting it on my bike. Problem is it's next to impossible to have an accurate voltmeter on my bike since the harness is so lossy. I have 14.4 across the battery, but only about 12.5 coming out of the key switch, 12ish at the headlight, and down to 10ish at the blinker relay. I have a Kuraykyn(?) led voltmeter that I put on tapping it off headlight power and it never got to the green, which annoyed me so I took it off again.
My Max has by far the most lossy wiring of any machine I've ever dealt with. The voltage is so low the blinkers don't work right if it's idling(down to 13 at the battery, or less than 9 at the blinker relay). Pisses me off, and there's nothing I can really do about it short of replacing the main + wire to the ignition and the switch, which from what I can see are responsible for most of the losses.