The Hario POLARIS Coffee Scale (Black) is a brewing scale built for pour-over and drip coffee, combining weight measurement with an on-board extraction ratio calculator and real-time brew-percentage display. The scale measures from 0.1 g to 2,000 g and includes a built-in timer, giving brewers a single tool to manage recipe, pour volume, and timing in one session.
Setting up a recipe by hand means converting between coffee dose and water volume every time you change beans or adjust strength. The Hario POLARIS handles that conversion automatically: enter the weight of your ground coffee and select an extraction ratio, and the scale calculates the total water target for you. At a 1:15 ratio with 20 g of coffee, for example, the display shows 300 g as the water target without any manual arithmetic. For brewers who are still dialing in a recipe, the ratio range spans concentrated brews (as low as 1:1) through light, clarity-focused brews (up to 1:30), so the same scale works across a wide range of styles and preferences.
Knowing the target water volume is useful; knowing how far through the pour you are in real time is more useful still. The POLARIS displays the current brewing percentage as water is added, calculated as current water poured divided by total water target. That live readout lets a brewer pace bloom pours, staged pours, or continuous pours without stopping to check a separate timer or do mental division mid-brew. The built-in timer activates via the TIME MODE button and runs alongside the weight display, so both measurements are visible on the same screen during the brew.
The POLARIS measures 127 mm wide by 165 mm deep by 27 mm tall, a footprint that fits under most pour-over drippers and leaves room on a standard kitchen scale mat or drip tray. The body is ABS and acrylic resin; silicone rubber feet keep it from shifting during pours. Packaged weight including the individual box is approximately 437 g.
| Specification | Detail |
|---|---|
| Capacity | 0.1–2,000 g |
| Dimensions | 127 mm W × 165 mm D × 27 mm H |
| Packaged weight | Approx. 437 g (including individual box) |
| Body materials | ABS resin, acrylic resin |
| Non-slip parts | Silicone rubber feet |
| Color | Black |
| Country of manufacture | China |
The Hario POLARIS suits pour-over and drip brewers who want to track extraction ratios and brew progress without managing a separate calculator or timer. The 2,000 g capacity covers single-cup through larger batch sizes, and the compact footprint fits most home brewing stations.
The POLARIS measures to a minimum increment of 0.1 g and is not suited to espresso workflows that require finer resolution than that. It is also not a kitchen or food scale intended for general cooking use.
The Hario POLARIS extraction ratio function takes the weight of ground coffee on the scale and multiplies it by a ratio you select with the + and - buttons. The result is the total water target displayed in grams. For example, 20 g of coffee at a 1:15 ratio produces a 300 g water target, shown on screen before and during the brew.
The Hario POLARIS supports extraction ratios from 1:1 through 1:30. Lower values (1:1 to 1:14) produce stronger, more concentrated brews; higher values (1:15 to 1:30) produce lighter brews that emphasize clarity and delicate flavors. The ratio is adjusted using the + and - buttons on the scale.
Yes. The Hario POLARIS includes a built-in timer activated by the TIME MODE button. When the timer is on standby, the button lights up. The timer runs alongside the weight and brew-percentage display, so brewers can track elapsed time and pour progress on the same screen without a separate device.
The Hario POLARIS measures from 0.1 g up to a maximum of 2,000 g. The 0.1 g minimum allows precise measurement of small coffee doses, while the 2,000 g ceiling accommodates larger batch brews or weighing a full kettle of water on the platform.
The Hario POLARIS measures 127 mm wide, 165 mm deep, and 27 mm tall. That footprint is compact enough to sit under most pour-over drippers on a standard brewing station. The packaged weight, including the individual box, is approximately 437 g.
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