You can't. That's the point. You are setting the size of the restriction. You have to watch the stream for flow rate and the manometer for pressure and adjust the valve as you go. There's a recent discussion of this here at "Understanding Brew Pressure, Flow, Valves, and "Slayer Shots""

May I know what kind of water do you use ?

Dear reviewer, May I know does it come factory zero chirping or I have to self-calibrate to zero chirping ?

If the temperature is 200°F, it's the brew temperature. I ran an e61 HX boiler @ ≈227°F for mid 190's brew temperature

Price. Something that can also roast a pound at a time that has actual control over what you're doing is in the $2k plus range. Maybe that is changing now with some of the Ali express roasters mentioned

Hey folks....Ross has a 3-D printed wrench he uses in the shop. He's offered to send me one. Will report back. And a big shout out to Ross

+1

Loved that your reply on the fs link is in German . Since it is closed I assume you bought the MC6? What are the odds an almost brand new grinder came available in your country with extras and correct power configuration? Sometimes the stars are aligned

Or it's that new cutting edge coffee substitute made from baked beans?

FYI for Canadians: the pre-order is now live at EightOunce in Calgary. $499CAD (same price as the Ratio 6). No free coffee, but a very good USD:CAD exchange rate and about $10 in points off a future purchase from EightOunce (if you sign up to EightOunce's loyalty program). {link}