The Applied Biosystems MicroAmp 3 x 32-Well Retainer is specifically designed for use with single tubes and tube strips on the ProFlex 3 x 32-Well PCR System. The retainer provides support and allows pressure to be distributed evenly over tubes and strips to ensure a proper seal and prevent the tubes and strips from being crushed or deformed. Its use is recommended at all times when working with MicroAmp reaction tubes and tube strips. Simply place the retainer on the sample block, then load the tubes or strips.