Precautions:This instrument is a precision optical instruments， in the use and maintenance should note the following:In use， it must carefully and deliberately， in strict accordance with applicable instructions， each instrument shall be arbitrarily connecting portion loose， not drop， bump， shake violently prohibited.After use， forbidden cleaning in water directly， should wipe with a clean soft cloth， to the optical surface， not bumps， scratches.Instruments should be stored in a dry， non-corrosive gases place custody.Avoid Spare parts to loss.Features:Brix scale: 0 to 32%BrixATC Compensation Range: 10��C~30��C (50��F~86��F)Usuage:This refractometer is specifically created for brewing of BEER but it can also be great for:Fruits， vegetables & grasses:monitor and control sugar concentrations in foods， beverages， crops and plants， checking the ��ripeness��of fruit in the field and verifying product quality after harvesting and/or controlling concentrations during processing and packaging to ensure product qualityWine or beer:use Brix readings to get wort sugars and help determine finished alcohol readings (for alcohol reading， best use in conjunction with a hydrometer)Metalworking fluids:helps in maintenance of CNC coolants and water soluble drawing & stamping compounds and commonly used for controlling the concentration of various industrial fluids like cutting lubricants and flux rinsing compoundsThe need to consult temperature correction charts is eliminated with the built-in 10-30��C ATC. The unit also comes with a manual calibration knob that is secured with a lock nut and has a brighter display than the more narrow range refractometers.Package Included:1x RSG-100ATC Refractometer1x Pipettes1x A Mini-screw driver1x Protective carrying case