Quote:
Originally posted by Matt_Wandell
I'm just assuming that a second calibration point can only make it more accurate.
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Now maybe I've just been out of the lab for too long, or I've been teaching a more rudimentary lab that doesn't deal with too much accuracy but... how can you get a 2nd calibration point to "work" with something that only has one mechanism to calibrate, i.e. a screw in the case of refractometer (I'm unfamiliar with conductivity probes maybe they work differently?)
Assume you calibrate to your 35ppt solution, then you go to the 0 tds solution, if you adjust to that second solution your first adjustment is now off. Or is there some rational as to why you'd measure at one level other than the other? I would think if anything the adjustment to a known solution that's closer to what we want to measure is more important.