pH monitoring with Atlas Scientific pH stamp

Hi,

here is the Datasheet: http://atlas-scientific.com/_files/pH_Circuit_3.0.pdf
yes this seems to work actually :D, but it is giving me a continuous reading:
3.763.523.493.523.523.583.603.563.583.603.603.583.583.563.523.583.60
I only have 1 sensor attached for now, later I'll be attaching an EC sensor http://atlas-scientific.com/_files/EC_Circuit_2.0.pdf and a temperature sensor to be able to take accurate pH and EC readings.

thanks a lot for the help XD