An espresso scale is vital in calibrating the grind and handy for weighing the espresso shot.
To set the grind you need to know how much coffee is in thePortafilters. Place the portafilter on the scales and press Tare – scales will show zero – grind the beans until you have 18 grams in the basket – weigh the portafilter to check the weight of the Ground Coffee.
It should take anywhere from 22 - 28 sec for a 60ml pour, using 18 grams.