I am sure everyone else is as skeptical as me but I was wondering if anyone has actually purchased this unit or knows anything about it? It is an obvious knock off of some American Brands shipping from Hong Kong, but if it works it would be a big money saver at $123. It tests pH, PPM, Temp, ORP? MV?.... http://cgi.ebay.com/7-in-1-Meter-Te...5|66:2|65:12|39:1|240:1318|301:1|293:1|294:50 anyone?