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Phenolphthalein Test Paper [Vial of 100 Paper Strips] for Qualitative Leak Detection of Ammonia Vapors industrial 39” 2 x Modular 4”Phenolphthalein Test Paper [Vial of 100 Paper Strips] for Qualitative Leak Detection of Ammonia Vapors About Bartovation From our headquarters in Queens, New York and with the help of our distributor network, we service customers all around the globe. We specialize in the production and distribution of testing strips for virtually every application. We value every one of our customers and strive to make them happy and satisfied. This item is proudly