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Optical pH tester: one version of the researchers’ experiment.
Optical pH tester:An empty petri dish with two optical fibers, illustrating one version of the researchers’ experiment. The left-hand fiber (usually shining infrared light, but depicted here as visible red light) is a temperature sensor. The top fiber shines green, red or blue light into the petri dish to adjust the signal that the temperature sensor measures. Image: Jennifer Lauren Lee/NIST.
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