------------------------------------------------------------
[PHXv2] Live readings — raw vs window=5 averaged
------------------------------------------------------------
  30 readings: pH_raw / pH_avg(5) | RX_raw / RX_avg(5)
  #    pH_raw  pH_avg  | RX_raw   RX_avg
  1    2.533   2.533  | 522.6   522.6
  2    2.533   2.533  | 522.6   522.6
  3    2.533   2.533  | 522.6   522.6
  4    2.534   2.534  | 522.6   522.6
  5    2.533   2.533  | 522.6   522.6
  6    2.533   2.533  | 522.6   522.6
  7    2.533   2.534  | 522.6   522.6
  8    2.533   2.533  | 522.6   522.6
  9    2.533   2.534  | 522.6   522.6
  10   2.534   2.534  | 522.6   522.6
  11   2.533   2.533  | 522.6   522.6
  12   2.533   2.533  | 522.6   522.6
  13   2.532   2.534  | 522.6   522.6
  14   2.533   2.533  | 522.6   522.6
  15   2.534   2.533  | 522.6   522.6
  16   2.534   2.534  | 522.6   522.6
  17   2.533   2.532  | 522.6   522.6
  18   2.533   2.534  | 522.6   522.6
  19   2.534   2.533  | 522.6   522.6
  20   2.533   2.532  | 522.6   522.6
  21   2.533   2.533  | 522.6   522.6
  22   2.534   2.533  | 522.6   522.6
  23   2.534   2.533  | 522.6   522.6
  24   2.533   2.533  | 522.6   522.6
  25   2.533   2.533  | 522.6   522.6
  26   2.534   2.533  | 522.6   522.6
  27   2.533   2.533  | 522.6   522.6
  28   2.533   2.534  | 522.6   522.6
  29   2.534   2.533  | 522.6   522.6
  30   2.533   2.533  | 522.6   522.5
------------------------------------------------------------
------------------------------------------------------------
pH: 0.002 total variation across 30 reads (10ms in between 
each sample taken) — rock solid RX: 522.6 mV perfectly stable 
— not a single digit change for 29 reads.

Summary:

Min reading:  2.532 pH
Max reading:  2.534 pH
Peak-to-peak: 0.002 pH
RMS noise:    ~0.001 pH (estimated)

Min reading:  522.5 mV
Max reading:  522.6 mV
Peak-to-peak: 0.1 mV
RMS noise:    ~0.05 mV (estimated)

The PHX v2 hardware is so well designed that rolling average 
has minimal visible effect here.