The best replacement for litmus paper is ph paper.

The best alternatives to litmus paper are rated as following:

★★★★★	ph paper
★★	universal indicator
★	blue litmus paper
★	cabbage juice
	red cabbage juice
	ph meter
	red litmus paper

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Speaking about litmus paper, one probably shouldn't forget about acids and bases.

Other search terms related to litmus paper and their ratings are:

★★★★★	acids and bases
	amniotic fluid

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Google Trends

Scale is based on the average worldwide traffic of litmus paper in all years. Click on graph for more.

litmus paper

ph paper

universal indicator