Rather than paying this price for this meter, your much better off looking for a satlook digital on ebay. I've seen them go on there for $400 to $500 and it's a much better device for aligning a dish or feed hunting.
This Trimax "meter" is basically just a small handheld receiver and LCD tv in one and as such doesn't give any of the functionality of a real spectrum analyzer. Basically this device is no better than simply taking your receiver and a small TV out to the dish. As such they should only charge a couple hundred bucks for it at most.