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Nope, its calibrated with the calibrating solution that a friend has. Either way, you can do it with RO/DI water. We did test the difference between both methods, and the difference was 0.Does the refractoneter need to recalibate? I'm interested. Thanks
I will take the refractometer send me PayPal info
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How many lbs. of rock and what would you estimate shipping to Vancouver, WA 98662?

