I have had my refractometer to test my salinity for over a year now and it doesn't seem to hold a calibration but from use to use. What is a good one to buy I know they can be hit and miss and not hold a calibration.
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I calibrate mine before each measurement, which means multiple times when mixing saltwater... It's so easy to do and then I don't need to worry about it being off.I have had my refractometer to test my salinity for over a year now and it doesn't seem to hold a calibration but from use to use. What is a good one to buy I know they can be hit and miss and not hold a calibration.