What you see in this photo is a nice tool of the trade.
The gauge displays the accurate brew pressure at the group.
The digital thermometer displays the group temp.
I adjust the expansion valve for brew pressure & the pressure stat for temperature
for about max Bar pressure 10 & temp 200 f.
This portafilter fits several machine groups.
For those with different portafilter sizes I have PSI gauge
& thermometer attachments.
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