are these compatible with the Hach BD40 digestion block?

We have not tested these tubes with that digestion block. You would need to compare the dimensions of 26mm x 300mm to see if they match.

Do you sell the racks for these tubes?

We do not have racks to fit these tubes. We carry these as a convenience for those who have TKN blocks from other companies. They do not fit in our TKN block or rack.

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