Isotech-Mercury-Apparatus The Isotech Model ITL-M-17725 apparatus is a self-contained, mechanically-refrigerated, system with a main well to house one mercury cell and two auxiliary wells for pre-chilling of thermometers. *The cryostat temperature is adjustable from -36°C to -42°C. *Simple to use, safely melt and freeze Hg Cell *Purpose Designed for Isotech Mercury Cell *Outstanding Convenience and Safety *Liquid free