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. 2020 Apr 2;10:5824. doi: 10.1038/s41598-020-62197-3

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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(A) PLA 3D printed device to conduct measurements. (1) Printed graphene based electrodes. (2) Regulated electrode grip allowing to precisely established contact points with material surface. (3) Silicon insulating connection between wires and electrodes. (4) Am fixed in Cellcrown. (B) Rendered model of constructed device showing electrode fixation and arrangement in cross view. (C) Setup used for conductivity evaluation. (1) Four-sensing probe. (2) Function Generator. (3) Multimeter. (4) Oscilloscope.