I bought two packs of 4 x 50mm rods. only two out of 10 can turn on the stirrer. the other eight are so unbalanced that they crash against the container wall after just one or two turns. At an ultra-low rotation speed, you can see them deviate 1/3 of their length from center for a moment and then fly away. Complete nonsense. Didn't think to check them before preparing my cultures and now labor and cultures are wasted
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