When we introduced the screw cap micro tubes about 35 years ago, we established a new class of safe screw cap tube which has proven its worth time and again. The particularly safe O-ring screw cap makes it a versatile piece of equipment. Ideal as a centrifuge tube, transport and storage tube, e.g. for high-grade synthesised oligonucleotides, enzymes and buffers. Clean room conditions, trained staff in protective clothing and automatic production processes are the prerequisites for the certified Sarstedt quality standards 'PCR Performance Tested' and 'Biosphere® plus'.