There are two types of scales needed for most modernist cooking. The Kilogram/Pound Scale is used to weigh the heavier ingredients in a modernist recipe. These are also called a "kitchen scale" or "food scale." They usually have a maximum weight handling capability in the range of 2.2 kg to 4.5 kg (5-10 pounds). They typically have 1 gram and/or 1/8 ounce increments.
It is also important the scale has a "zero" or "tare" function. This allows the scale to be reset to zero when making measurements. Then you can continue to add ingredients to the same bowl, just zero out the scale between each addition.
These kilogram scales are what we recommend to our friends and family. While one might be a better fit for you personally, you can't go wrong with any of them. These are mainly with a focus on home cooks (see below for professional machines).
Have you used something that we don't cover here? Let us know what you use and why you love it!