http://aquadirect.com/store/customer...&cat=87&page=1
this is what you're talking about right? the octopus 3000? i've used it once, one of our rediculous clients (big $$$) with a 700G reef tank had one in his setup. it served no real purpose. just another (very expensive - $800.00!!!)gadget. the one good thing about it is that you can easily see what the temp, pH, etc are instantly.
for your purposes, it would be a waste of money. just test your water as you always do weekly and keep up with good maitenence practices and you will be fine.