ICL’s Pres-N-Lok Cell enables the user to analyze mulls and smears without the use of clumsy springs, nuts, and bolts. The cell is assembled by placing the sample on one (1) of two (2) 25mm x 4mm crystal windows separated by a PTFE spacer, dropping them into the bore of the inner barrel, and pressing in the outer barrel. The cell consists of a back plate of anodized aluminum, a self locking inner barrel with a Viton® O-ring over which the outer barrel slips on and off with ease, and assorted PTFE spacers.