From the abstract: > The sensor consists of three components: (i) a small potentiostat device, (ii) an interface allowing connection to a smartphone for monito

From the abstract: > The sensor consists of three components: (i) a small potentiostat device, (ii) an interface allowing connection to a smartphone for monitoring and control, and (iii) the sensor (an N-doped GrNPs/ePAD and detection chamber) It sounds like the smartphone isn't a display. It's the main driver, data collector, and filter of the device.