I just got my refractometer in today. It did not come come with any calibration oil and very poor instructions. I checked a bucket of honey that I have already sold some out of and it reads around 20. I have 2 questions. 1. Does anyone know how to calibrate OR where to get the calibration oil? I have read to use some extra virgin olive oil and set to 71 brix. My meter has 3 scales on it. My olive oil is reading 69, if I adjusted to 71, that would actually put that Honey at around 18. 2. Should I be worried about the honey I have already sold at 20%? How critical is this? Seems like folks have been eating and selling honey long before we had refractometers.