A video comparing 0.25mm, 0.3mm, 0.35mm and 0.4mm acupuncture needles for performing Weiss Distribution Technique (WDT) for espresso puck preparation.

Chapters
00:00 Introduction
01:58 0.25mm needles
03:40 0.3mm needles
04:41 0.35mm needles
05:29 0.4mm needles
07:10 Conclusions