The E-meter is the same one I have installed. It's made by Xantrex who I find a pretty competent company.
I've had more experience with mine with a couple boondocking
trips and one backyard camping outing courtesy of the power grid. As mentioned elsewhere, it doesn't really provide anything that couldn't be had with a digital multimeter, but it is pretty handy. I like the forecast of how many more hours the battery
will last at the current current(!) drain. Sort of a one button check to see if it's time to think about the generator
for a recharge. I like it.
You've already cost me too much ;) with the LED lights
and various associated fixtures but heaven help me, the water gauge appeals to me as well. I can already hear some grousing from the back row about, Good Grief! how hard is it to open an access door and peek at the water tank? But, imagine; My access door on the Casita
is outside. I might bend over to look, crack my head on the open door, stumble backwards, trip over a camp chair and fall
on some passing orphan child, hurting them. I see this gauge as a potential must have! :r