PP floating racks keep microtubes submerged in a water bath, perfect for controlling sample temperature. Detachable legs give the user 2 options: attach legs so rack stands upright on benchtop, or detach them so samples can be quickly popped out by pushing down onto any surface. - Not autoclavable. PP floating racks keep microtubes submerged in a water bath, perfect for controlling sample temperature. Detachable legs give the user 2 options: attach legs so rack stands upright on benchtop, or detach them so samples can be quickly popped out by pushing down onto any surface. - Not autoclavable.