HERMLE Labortechnik · Zentrifugen: Home. New refrigerated microlitre centrifuge Z 207 MK. with powerful cooling system! Even at max. speed of 14,500 rpm and. 17,157 xg, the sample temperature. remains guaranteed below 4°C! Find out more. New cell culture package of our Z 207 A. for conical 50 ml and 15 ml tubes.