Hario Polaris Scale (Black)Introducing a brand new scale by HARIO: The POLARIS Scale This smart scale is designed to weigh coffee, calculate extraction ratios and assist in parsing out pours, and display your brews progress. The handy ratio calculation function helps you determine the perfect recipe for the amount of coffee beans you have to brew and clearly displays the specifications on the digital screen. The scale accurately calculates the amount of water used per pour and