The apparatus comprises an elongate base having means on one end for mounting {HEAD ~ the base} on {TAIL ~ a laboratory ring stand} and means on the other end of the base for allowing a technician to hold the microcentrifuge tube in one hand and to open and close the cap without requiring a second hand 
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The apparatus comprises an elongate base having means on one end for mounting { HEAD ~ the base } on { TAIL ~ a laboratory ring stand } and means on the other end of the base for allowing a technician to hold the microcentrifuge tube in one hand and to open and close the cap without requiring a second hand
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