@bubbajet @coffee @espresso
1 - extremely accurate. If you are going from espresso (1.15 on the clicks, or 115 in), to Chemex (somewhere around 3.4, or 340 clicks in) and go back to espresso, you will be within maybe 20um of your previous setting, very quickly
2. 35 second total shot time. first 10 seconds of that is preinfusion, then 25 sec full pressure run. I detail how we test espresso, here, if you're interested:
https://coffeegeek.com/opinions/history-technology/how-we-test-espresso-at-coffeegeek/