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CALIBRATION The J257 offers 1 point, 2 point or a full multi-point calibration. Calibration can be done at 20C, 25аC or any user selectable temperature within the available range. Regardless of how many times the refractometer has been calibrated, it can always be restored to the initial factory calibration if required. OPTIONS AND ACCESSORIES NIST Traceable Calibration liquids from 1.32 Ֆ 1.70.Continuous Flow, Micro Flow and Pour-In Style Pressers allow samplesto be continuously monitored or poured directly from a beaker. The J257 Standard Presser is easily removable with a captured hinge pin...