first rough go at it
When does the unit give an alarm? When levels are below required?
The Aseko Pool App can give alarms on both above/below levels for ph/chlorine/temp etc. 
Works very well for me, at least the last 30 minutes.
what is the margin between giving an alarm, e.g. ph required = 7.5, will it already give an alarm when 7.4 or 7.6? Or is there a tolerance of a few percent?
