I'm with Pimp on that one. Reverse Osmosis is a water purification process that removes not only nasties, but also most trace minerals, which is why people say you need Cal-Mag when you use RO. Many of the purified water refill machine thingies at grocery stores use RO (at least around here).

You can also get digital thermometer/hygrometers at Radio Shack.
warfrat73 Reviewed by warfrat73 on . temperature vs humidity what is the different between temperature and humidity in the room...well, i guess i know the temperature in the room and how to adjusted..but what is the humidity..how do you determine the humidity of the room and how do u adjust it..one last ques. what is RO water? thanks Rating: 5