Finally, we needed to provide a secure and protective housing for the new detector circuit board and separately the Raspberry Pi computer. The initial prototype 3D printed sensor housing was modified further to accommodate the RJ45 connector now included. The sensor device is an approximately 4.5 x 4.5 x 4.5 cm cube -still a very small footprint and thus very portable, allowing positioning wherever required in a fluidic system (Figure ). For the Raspberry Pi housing, a suitable case available on the Thingiverse was chosen. Minor modifications were made to accommodate the RJ45 connector we introduced, which stands taller than most Pi HAT devices.