Flow meters Create Talk0 Category page This page needs content. You can help by adding a sentence or a photo! Add to this page! “The penile plethysmograph (PPG) is a controversial type of plethysmograph that measures changes... Penile plethysmograph “The penile plethysmograph (PPG; also known as erectometer) is a controversial type of... Phallometry Pages in category "Flow meters" The following 2 pages are in this category, out of 2 total. P Penile plethysmographPhallometry Retrieved from "http://psychology.wikia.com/wiki/Category:Flow_meters"