It is matched to an apogee sensor. If you feel the readings are too high, you can adjust it by fiddling with the pot (blue thingy), counter clockwise to bring down the reading.
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Can you walk me through your calibration process? There is another guy in my local club that bought one too and is having similar issues. It almost seems like you calibrated to a low data value and the error just gets larger the farther we go towards the high end. I also noticed that outside it is invariably reading 1391 no matter what. Please advise.