Portable Air/Fuel gauge?

I realize that the setup I've ordered is not a true handheld portable unit but it did look like a more affordable route. I would have preferred a digital readout too but I figure it's better to keep the cost down until I figure out what I'm doing. - Then maybe someday down the road I'll invest a little more in a setup if I feel more confident in what I'm doing. Once again, Thanks t everybody for all the advice.