What Do The Lines Inside Your Nespresso Milk Frother Mean? - Tasting Table
Briefly

"Nespresso milk frothers are designed for two different types of milk preparation, signified by upper and lower maximum fill lines, catering to both steamed and frothed milk."
"Filling to the lower max line is essential for achieving optimal frothing as it allows space for the milk to expand and form the desired foam."
Read at Tasting Table
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