Hello Everyone

I have a problem with my KH Director PH readings.
Everything was right the last couple of months.
After a recalibration yesterday i have a zero ph reading and my ph 4 (ADC1) and my ph 7 (ADC2) values are both at exact 65518. Every recalibration i perform KH Director automatically set the values to a ADC value of 65518 independent of the calibration solution the probe is in. Eventhough if i hold the probe into the air the calibration automatically jumps to a ADC Value of 65518?

Please help!