@ocramius I did some hardware/software consulting a long time back for someone wanting to design/manufacture an espresso focused scale. There’s a bunch of non obvious things to consider. The big one is that load cells create very low level electrical signals and are hence “noisy”, so everyone uses averages over time to get readable weights. Some scales I’ve reviewed take several seconds worth of average readings, which means you always overshoot when measuring an increasing weight - like grounds coming out of a grinder or espresso coming out of a portafilter. There’s also espresso related features like automatically starting a timer as soon as it detects the first drop of espresso, or sounding an alarm when a set yield weight is reached. And logging of dose/yield weights. You can do way better than just another kitchen scale if you try.
It's more how the scale interacts with their R2 refractometer, how it charts and has a lot of super advanced features in the app for both brewing and espresso, and little things (maybe big things?) they add like the new functionality to fairly accurately estimate the particle size of your grinds via just a photo from your smartphone.
What I like about this scale is it offers a ton of complexity, but can also just be used very simply as well.
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