THIS IS THE MOST POPULAR BEER REFRACTOMETER SOLD ON AMAZON! Why? The Wort SG scale is CORRECT! With the BrixBrew, you can throw away your Beer guzzling Hydrometer! With just a drop or two of your Wort, you can get fast results on the fly while you are boiling your Wort. The Hydrometer needed a pint of fluid and seemed to take forever to stop bobbing up and down (how many hydrometers have YOU broken?). With this little gem, just take a clean wooden spoon and pull up your sample, place it on the Refractometers Prism, close the flap and look through the eyepiece. You have instant readings! Steps like this will help you achieve higher brewing efficiency. This unit boasts an insane price because of it's slick AMERICAN engineering. We make high end units too, so don't think we are all about cheap products, because we are not. See our store for more beer focused Refractometers. Please note that once your fermentation begins, the Brix/SG readings of this (or any) Refractometer will be wrong. It's just the nature of alcohol in a liquid - it will skew your readings. The good news is that there are online spread sheets that can assist in giving you corrected readings. Look on Google for them as we can't endorse one over the other. AGAIN, this unit will not measure accurately in the presence of alcohol. This instrument is only for measuring WORT or MUST in pre-fermented states. Got it? ALSO, this Refractometer is ONLY for measuring pre-fermented WORT and MUST. IT does not measure Cat Urine, Salinity, Antifreeze, Gemstones, Honey, etc. If you have a question about application of this refractometer, please contact Magnum Media and we will gladly answer you questions. We're EXPERTS! This unit comes with a two year warranty against manufacturers defects. What you get: (1) RSG-100ATCc Brix/Wort SG Refractometer, (1) clear, Resealable Pouch, (1) 3ml Plastic Transfer Pipette, (1) Calibration Screwdriver, (1) Users Guide (in English!) for Brewers