Powders for testing ph

I know that someone I think @GreenJewels or @Missiles not sure told me where they got up and down powders, calibration solution, storage solution. I need to get it or order it thanks ahead of time if anyone can help

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Good evening :grin: I get all mine from Amazon

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Any certain brand

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Either of these would work

Atlas Scientific pH Calibration Solution 4.00 & 7.00 125ml - 4oz (Pack of 2) Amazon.com

15-pack pH Meter Buffer Solution Powder For Precise and Easy PH Calibration, PH Calibration Powder Solution 6.86,4.01,9.18 Amazon.com