It is easy to use, ergonomic, and very sturdy. Your thumb controls the amount by easily moving the slide up and down. The cup holds both liquid and dry ingredients, and includes ml (30-140), liquid oz (1-4), tbsp (2-9) and cup (1/8-1/2) measurements. It has a magnet so it can be easily mounted on the fridge or other surface, comes apart for easy cleaning. Other sizes are promised.
From $10-$15. Available online at Sur La Table and other retailers.