This dual scale salinity refractometer is used to measure, monitor and control the concentration of salt water and brine, especially useful for aquarium and marine applications. This high quality refractometer measures on 2 scales, Specific Gravity (D 20/20) and parts per thousand and replaces your poor quality and difficult to read hydrometer. With just a couple of drops of aquarium water you know exactly what your salinity is. 3 Year Warranty against defects which is only available through Magnum Media. Brand New! What you see is what you get - Hard Plastic Case! Many in stock for rapid shipment (see our feedback)! Ships from California ASAP! Measures on 2 scales, Specific Gravity 1.000-1.070 (D 20/20) and 0-100 parts per thousand (‰) Measure salt water or salinity of water, ideal for aquariums and marine monitoring Features Automatic Temperature Compensation (ATC) from 10-30'C/50-86'F Comes with Hard Case, Plastic Transfer Pipette, Screwdriver and Wiping Cloth 3 Year Manufacturer warranty through Magnum Media Additional Details ------------------------------ Package quantity: 1