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Our entire SimpleStep ELISA™ range of products comes with a bulk packaged group of buffers, including the Sample Diluent NS. Thus, even though some of the kits do not require use of the Sample Diluent NS such as ab176112, we still send you the buffer because it is more efficient and cost-effective for us to do so and get the product to you quickly and at lower cost.
Kevin HansonAbcam Scientific Support
Answered on Sep 11 2015