Dear Mr. On, we are very pleased about you being our customer, and we are very sorry about the problems with our product sera pH Test.The images from your customer show a different colour of the two batches (sera pH Test batches 001451125 and 003442334) at pH 7,42.We tested the reference samples of this two batches at pH 7,5 and we found out, that there is only a very little difference in the colour between this two batches. The colour from the sera pH Test batch 001451125 shows at pH 7,5 a slightly pale green (see images 1-2, the batch 001451125 is on the right, the batch 003442334 is on the left), but both batches meet the correct colour on the chart (see images 3-4). There is no false mapping possible.The image from your customer shows reagent bottles that seem not to be slewed after adding of the reagent, this could distort the test. Please, tell your customer to follow the information for use of the sera pH Test.
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