Conflicting Brix

A day after pitching the yeast I check the temp and gravity.  There is activity already, temperature was up 3ºF even though it was a cold night (46ºF outside).  The weird thing is that I am getting a higher reading of 26ºB as compared to the the two other readings both coming out at 24.5ºB. I am mailing off the frozen juice sample today, maybe we should spend the extra $15 and get a definitive reading from them.