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