Hi, I am using E. coli pulser from Bio-rod. I tried to use cvuette repeated for more than four times after sterilized. It seems like good to reuse for another four times, there is no any sign of damage, with only arc(the sign of damage). But I don't know what sign the cvutte will show to indicate the cvuette is damaged, that is, not reusable. Thanks, Chen Linan