This modular block for Talboys dry block heaters is constructed from a solid anodized aluminum block making it ideal for temperature conduction and corrosion resistance. The close contact of tubes to block walls allows for maximum temperature transfer. This single block measures 3.75" x 3" x 2" and has a thermometer well for measuring block temperature. Two parallel slots fit 6 cuvettes in each slot, side by side. The well depth is 25.4 mm.