Also AB is cheaper, how can you not like a higher purity result at half the price, janoshik has issues with raws don't forget!
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below 2% is acceptable for intra-assay precision (same day, same equipment, same operator, same material)
below 5% is acceptable for inter-assay precision (different days, different operator)
Don't forget that with this variance, we would sometimes get oddly pure results too, like 98%, but I mostly get the lower range, must be bad luck or just janoshik huh? lol I wonder which.