Your valuable probes are in good hands with the centrifuge tubes from TPP!
Features of the TPP centrifuge tubes surpass ordinary tubes. They are:
manufactured with highest grade of raw material fulfilling requirements of USP Class VI
white writing circle, affixed on the screw cap, for easy labeling with any writing instrument
caps that cannot be over-tightened
gas and aerosol tight cap
graduations all the way down to 0.1 ml / 0.5 ml respectively
convenient racks available that are autoclavable and are collapsible for storage when not in use