Selecting a Heat Block on Amazon.com
A heat block, sometimes called a dry block or dry bath, holds individual containers such as test tubes, microtubes, or PCR tubes for consistent heating on a hot plate or dry bath. Most often constructed of aluminum to ensure uniform heat retention, heat blocks have a series of wells that hold a specific size container, such as 0.2mL or 2mL tubes, in contact with the walls of the well. Heat blocks are typically used with a hot plate or a dry bath specifically designed for the block size. Most heat blocks have a thermometer well that measures temperature at the middle of the block so operators can ensure that the temperature is stable throughout the block. Features to consider when selecting a heating block include block capacity and well size, block material construction, and whether the available heat source will accommodate the outside dimensions of the block.