Thank you, so during extraction I should not be concerned with boiler gauges they just show that they are charged up.
I still don’t understand what is this about,found in several places but this quote is from home barista forum.
“Most people receive their machines with the rotary pressure between 10-11 bar. You can certainly adjust it to 9 bar”
I have seen video where guy adjust with screw from somewhere on bottom of his machine back to 9 bars.
I’m confused here, we adjust our grind size to aim to 9 bars typically,what is that they are talking about?