PCR Sprint Thermal Cycler The PCR Sprint Thermal Cycler is ideal for users who want to perform small amounts of PCR's on a regular basis. Fast and efficient, the PCR Sprint has two choices of sample format: The 0.2ml block option has space for twenty-four tubes and the 0.5ml block option has space for twenty tubes. If your requirements change, the block is interchangeable so you do not need to buy a new cycler!