This unit is a 0-80% Brix SINGLE scale Refractometer with Automatic Temperature Compensation (50-86"F) range.Cool boiling samples before you test for best results (a drop or too will cool rapidly once you take it from your boiling pot).Comes in a plastic hard case with a calibration screwdriver, pipette, and users guide.Calibrate with distilled water as water will equal 0.00% Brix.Comes with a 5 year warranty against manufacturers defects.