The HC series by VLM GmbH is a Laboratory test tube block heater which is designed for 24 or 28 standard sample that is equipped with latest Peltier technology. It comes with a special electronic that protect the Peltier elements against superior stress that happens between heating and cooling intervals. As an example, at room temperature, the silicone seal in a solid heating or cooling tray and the cover over the housing functions as a preventive measure for penetration of condensation within the unit. Also, its heating tray is covered with a polycarbonate materials which is highly efficient because it prevents the formation of condensed liquid material. For longer test tubes, It can come with an available special dust cover.