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. 2019 Jan 18;5(1):eaav3294. doi: 10.1126/sciadv.aav3294

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Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license, which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.

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Fig. 5 — Calibration and corresponding color evolution for physiologically relevant levels of (A) chloride (n = 3) and (B) pH (n = 3). (C) Filling of sweat rate sensor. The arrow indications the direction of filling. (D) Image illustrating the chrono-sampling feature of the microfluidic system. Photo credit: Jungil Choi and Jonathan Reeder, Northwestern University.