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Comparison for temperature stability during the shot between a cheap Aliexpress PID controller Vs. PID kit from Auber. Real temperature has offset -8°C. I use 16g ground coffee and same baskets for both machines. Static brew pressure is adjusted to 9.5bar for both as well.
Settings on both are:
P: 4.0/I: 60/D: 15/Souf: 0.2/ot: 2/Psb: - 008