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Using the same hole for the reference thermometer and the test probe may have
better results. This however requires switching the probes which takes more
time. One must allow a few minutes after inserting the probes for the tempera
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ture to stabilize before making measurements. Because of temperature varia
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tions along the length of the well, best results are obtained when comparing
probes of similar construction and inserting them the same depth into the well.
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6 General Operation
Calibrating Probes