This unit is a 0-90% 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. Don't be duped by Imitations! Only MAGNUM MEDIA offers the MAGNUM_MEDIA RHB-090ATC 0-90% Brix Refractometer with a 5 Year Warranty. Please report fakes to AMAZON and us for prosecution. 0-90% Brix Refractometer used for measuring the sugar content of Maple Tree Sap and Maple Syrup when the sap is boiled down. Great for UNKNOWN Samples too! Comes in a plastic hard case with a calibration screwdriver, pipette and users guide. From SAP to SYRUP! This unit has you covered! 0-90% Brix Scale - Solid Metal Construction Comes in a plastic hard case Made for the Mapler in mind! Check your sap all the way until it becomes syrup! 5 year warranty!