A WDT (Weiss Distribution Technique) tool is an essential instrument for baristas and coffee enthusiasts looking to improve their espresso extraction consistency. The primary function of a WDT tool is to evenly distribute coffee grounds within the portafilter before tamping. Uneven distribution can lead to channeling, where water flows through the coffee in an unintended manner, resulting in under-extraction and off-flavors.

Typically, a WDT tool consists of a handle with multiple fine needles or prongs attached. The user inserts the needles into the coffee grounds in the portafilter and moves them in a circular motion. This agitation helps break up clumps and allows the coffee particles to settle evenly, promoting uniform extraction during the brewing process.

By utilizing a WDT tool, baristas can achieve a more consistent puck density, which translates to improved flavor clarity and overall shot quality. For those serious about espresso, incorporating a WDT tool into the brewing routine is a step toward mastery of the craft, leading to richer, more balanced cups of coffee.