Abd wrote: "Basically, the device does some math for you, based on certain assumptions. Unfortunately, the assumptions are the very issue here!"
I don't' think that's correct... Not assumptions. The instrument does calculations based on scientific laws and uses what measured variables it does have to calculate different units... For example, Relative humidity is calculated from Absolute humidity and temperature and pressure. The instrument, if it has the right probe, is measuring atmospheric pressure, temperature and at least 3 or 4 other variables. It then provides the convenience of displaying other units, like mixing ratio, based on the actual measured variables and specific scientific laws (mathematical equations). I have never seen an instrument that bases the display of other units on assumptions. I certainly wouldn't buy one! -Mark
