Short summary: yes, it's useful. And I use it every time when brewing a new lot of coffee. I don't use the app all of the time, because after practicing - I remembered my favorite TDS and this is enough for me to make an adjustments. I calibrate it once a week or when the room temperature changes. It calibrates my taste buds so that I'm always know what is a properly extracted coffee and what is under extracted.
![Does Higher Extraction Make Better Espresso? [Refractometer Tests]](http://i.ytimg.com/vi/TzH75RMwKTM/mqdefault.jpg)
Short summary: yes, it's useful. And I use it every time when brewing a new lot of coffee.
I don't use the app all of the time, because after practicing - I remembered my favorite TDS and this is enough for me to make an adjustments.
I calibrate it once a week or when the room temperature changes.
It calibrates my taste buds so that I'm always know what is a properly extracted coffee and what is under extracted.
And just in case, they sent me the device, but haven't checked the video before publishing and didn't ask for it
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