Refractometer help
Hey guys,
I just got my refractometer in, and I am following the calibration instructions. It says to add 1-2 drops of RO water to the prism, shut the plate, wait 30 seconds and then use the calibration screw to line up the blue and white boundaries at 0. I put the water in, however no matter how much I screw the calibration screw in/out the meter is always white. What do I do?
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