This document summarizes the Sebumeter, a device that objectively measures the amount of sebum on the skin. The Sebumeter was invented by Antoine Kawam in 1992. It works by using a special tape in its measuring head cassette that becomes more transparent with greater amounts of deposited sebum. The cassette is placed on the skin, then inserted into the device, which uses light and a photoelectric receiver to measure the transparency of the sebum-coated tape. The microprocessor then calculates and displays the sebum level in mg/cm2. The Sebumeter provides an objective way to measure skin oiliness, which is important for determining the proper skincare regimen.