Dr.LipidDallas said:It helps to say which part of this you are uncertain about.
Same experience, arrived at from the opposite direction.
Following on from LabKate — and this may be the naive question:
How long did you give it before you decided it was working?
Dr.PathRoch said:Say what you would expect to see if you were wrong, before you look.
Filing a mild objection. Mild because I might be wrong; an objection because nobody has addressed the case that does not fit. The objection nobody has made: this only works if the measurement is doing what we assume it is doing, and that assumption has not been tested here.
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Shop Reference StandardsDr.PathRoch said:Say what you would expect to see if you were wrong, before you look.
That is right for the common case. Whether it is right for the case being asked about depends on a detail that has not been given.