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Examples of lab-on-a-chip sensors used in extreme environments. (A) Close-up of the paper-based sensor and the reading unit; (B) the sensor in the field during recent fieldwork in the Puna plateau (arid desert with altitude above 4,000 meters); and (C) example of data collected in the field relatively to the measurement of copper (II) ions directly onto the screen-printed strips using a PalmSens Sensit as a portable readers powered by a smartphone.
