These are one of our favourite sets of scales, and ones we use at home when brewing coffee.  Reasonably priced, they have a built in timer so it is much easier to keep an eye on those brew times.

Unlike the Felicita scales, these are not waterproof so you need to be careful if using them on an espresso machine.  That said the silicone mat makes it easy to balance your portafilter and the display on the front is perfect when trying to extract the perfect espresso.

Green backlit screen
Automatic shutdown in 5 minutes (not active if the timer is running)
2 batteries 1.5V AAA
Units of measurement: g/ml - oz - Lb
Precision 0.1 g