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. 2019 Jul 27;19(15):3307. doi: 10.3390/s19153307

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Our developed add-on gadget and its usage for data acquisition. (a) Add-on gadget designed and manufactured by 3D printing, and (b) image acquisition setup using the iPhone X with the add-on gadget.