The alcohol content can be used to determine the fermentation rate of grape juice (by volume). Measuring range: Brix: 0-30%. Instructions for use: Place 2-3 drops of sample on the main prism, close the cover, and read the Brix value through the observation window. Calibration: Zero-point calibration with 20°C water; automatic temperature compensation range 0-30°C (ATC).

Packing list: Refractometer, hard plastic case, mini screwdriver, 1 pipette, instruction manual.

Instructions for use: Open the cover and carefully inspect the prism with a soft cloth. Place a few drops of test solution on the prism. Gently cover the prism, avoiding air bubbles, and spread the solution evenly over the entire surface of the prism. Point the incident plate of the instrument towards a light source or a bright area, observe the field of view through the eyepiece, and rotate the eyepiece adjustment wheel until the blue and white boundary line is clearly visible. The scale on the boundary line indicates the concentration of the solution.

Calibration and temperature calibration: The instrument must be calibrated to zero before measurement. Place a few drops of distilled water on the detection prism. Rotate the zero adjustment screw to adjust the scale to 0%. Then wipe and test the detection prism. Alternatively (only applicable for sugar determination), a temperature calibrator can be used to add (or subtract) the calibrated temperature value to the reading at ambient temperature to obtain an accurate value.