ABBE Refractometer 0-95% Brix 1.000-1.700 Refractive Index, Digital PA203x The calibration knob can be

The calibration knob can be tightened with a simple turn

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protein concentration in plasma or serum

These are an Automatic Temperature Compensation (ATC) model with water resistant properties (IP65)

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ABBE Refractometer 0-95% Brix 1.000-1.700 Refractive Index, Digital PA203x The calibration knob can beAbbe Refractometer Model 2WAJ With Digital Thermometer This Abbe refratometer is an excellent, affordable instrument for the refractive index (nD) analysis of liquids, glass, plastics and film. EASY TO USE Operation consists of placing a sample on the prism; while looking through the eyepiece, the control knob is turned until the shadowline is centered in the crosshairs. The reading is taken where the vertical line crosses the scale. Calibrates with