PLEASE HELP!! does anybody know if i can use the nutriculture ph test card with nutes

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i havent tried yet but can i test ph with this when nutes are in water or do i need a ph pen?
 
:eyesmoke:the reason i ask is because im using organic nutes with bloombastic and when they mix it makes water go really dark brown. i know if i ph test water before the nutes it will change ph when they mix, this is what i use..
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[/URL][/IMG]THANKS IN ADVANCE
 
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