I just found out about this device and can't believe how much it can do. Has anyone had any experience with these? If so what are the pros and cons of this unit. Is there something out there that is better/ more user friendly. I realize that if money were'nt an option, of course there is better, but come on, I don't make alot of money and most of it is spent on this hobby anyways. I like the idea of being able to monitor ph. Is there one that you can monitor multiple things like ph, salinity, temp,orp,calcium and maybe others. Without spending more than 500.00? Thanks, Vinny