Sargent-Welch P.T.C. Paper & pH Testing Papers - $179 - (Plain Dealing, LA)
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Posted 1 month ago
Sargent-Welch P.T.C. Paper Testing Strips and pH testing strips/ Comes with 7 charts/ over 250 strips/ Not used (Wife is Science Teacher Bought for class but did not use them) Great for science labs at school.
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From ebay.com - 1 month ago