0.5-mL Sample Block Module 1-13Heated Cover The heated cover slides over the sample block and performs two functions: It raises the temperature of the upper part of the tube (the part above the sampleblock) above the temperature of the sample mixture. This eliminatescondensation, which may have a negative effect on your chemistry. It puts pressure on the reaction tubes and frame to seat them firmly and preciselyin the sample block. This is important for proper heat transfer.Peltier Heating/Cooling UnitThe internal Peltier heating/cooling unit is housed in the sample block module. Thesample block module is made of aluminum to provide the optimal thermal transferrate.A Resistive Temperature Device (RTD) sensor in the sample block module provides: Wide temperature range: 4–99.9 °C Accuracy: ±0.25 °C from 35–100 °C Heat/cool rate: 1.5 °C per second Temperature uniformity: ±0.5 °C (measured 30 seconds after the clock starts) Long-term stability and high reliability