Our accurate Peltier temperature controllers feature a wide temperature control range of 20 to 60°C (68 to 140°F) and can be made to accompany a variety of cell holder configurations (single cell, 1x1, 6x6, etc.). It is suitable for all water-thermostated cuvette holders (not included). The PCB 1500W includes an internal Peltier block for either heating or cooling of the circulating water.