Versatile Dry Block Heaters are ideal for applications that require temperature stability. All units hold 4 optional interchangeable modular blocks with over 40 choices. Blocks are easy to use, no tools required. Close tube-to-block contact enables maximum heat retention, resulting in efficient heating. Digital models offer exceptional temperature uniformity and stability for repeatable results, while non-digital models are an economical choice.Designed for flexibility with your applications. The four-block capacity allows you to process multiple samples simultaneously with one device.Ensure temperature accuracy. Digital models include a unique single point calibration feature to match the block heaters display to a known external temperature standard for 3 temperature setpoints.Digital models feature easy to use touchpad controls with independent displays for temperature and time. Robust non-digital models are controlled with dual temperature adjustment knobs.