This Thermo Scientific® ELED cuvette block holds 12.5mm cuvettes. These blocks are made of anodized aluminum for the greatest heat transfer and retention. For use with the digital 2000 series and analog 2050 series modular block dry baths. Designed to provide close contact of tubes to block walls for excellent heat transfer. Includes thermometer well for monitoring block temperatures, block puller for safe, easy block removal. Dimensions (L x W x H): 3.75 x 2 x 2.9in. No. of Wells: 12. Size: 12.5mm. Thermo Scientific® ELED #: 2066Q. Thermo Scientific ELED - “Every Lab, Every Day”.