cowboy Joined Dec 3, 2014 Messages 209 Reputation 0 Reaction score 3 Points 0 Age 38 Dec 28, 2014 #1 What is the right one to use? When you talk ppm you never say the conversion factor. So which is it? Thanks in advance.
What is the right one to use? When you talk ppm you never say the conversion factor. So which is it? Thanks in advance.
