找到前陣子Paul對壓力表的說明。 There are a lot of espresso machine manufacturers in a bind at the moment. Pressure gauges are a big problem now, the supply is very tight so we had to revisit the old gauge factory. Their gauges are good but more work for me as I need to polish them, the newer style gauges were easier to install but they are so slow to produce.
以前沒濃度計,以為濃稠度等同濃度,有濃度計之後發現事情複雜一些。非配方豆,經常,淺焙濃度超過10的,口感往往不及只有8 or 9,深一點的豆子濃稠(以上可以推論出濃稠度等同焙度),但有時候又不盡然,就是會碰到不合這規則的,有些豆子沒那麼深,卻又濃稠度較同焙度的高很多。非自烘者,所以比較只能在不同豆子間進行,不得其解。