seneye is a small device that reads the ph/ammonia and also has a par/lux meter for checking light output. It just sits in my sump plugged into an old laptop computer and emails me if things go out of wack. Here is a link to some info. They are cool i use mine mainly so i don't need to check ph and ammonia has only ever spiked after mass die off. pretty useful if you don't have an apex or something like that.
http://reefsupplycanada.com/cgi-bin/...ada&item=58402