A coffee scale is the most useful accessory for home coffee brewing amongst all accessory options, regardless of brewing method. 

The final results in a brewed cup of coffee depend on the ratio of coffee to brew water by weight. If you want to make consistently good coffee day after day, then a coffee scale is a must have accessory. 

In addition, a good coffee scale is a must-have for the pour-over brew method. When coffee is brewed this way, three variables affect the taste of resulting cup of coffee: 

1. Grind size of coffee

2. Contact time with water 

3. The amount of coffee grounds

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Unfortunately they are not independent of each other, which is why precise measurement of coffee, time and water is so useful.

How is a coffee scale different from a kitchen scale? Three major differences:

1. No 60 second auto shut off - needed for longer brew durations, e.g., in pour-overs. 

2. Higher resolution - 0.1 or 0.01gm

3. The immensely useful timer function