I was in the field in Malawi two weeks ago and had a beekeeper show me his refractometer. We could never get a clear reading on the scale in the device and I was unable to clear up the problem with cleaning and an attempted calibration. We could read the numbers but could not get a good color contrast line to make a reading on the moisture content. Does anyone have any advice on fixing this refractometer?
thanks,
Bill Lord
Louisburg, NC
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