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strange Ph readings

I think I'm having some problems with my CO2 and Ph readings

My Dupla CO2 tester is giving me different reading from my Ph and KH

One week ago everything was ok but now my PH is 6.5, KH is 4 and CO2
reading is on 10-15 mg/l . How is this possible.
Is there anything wich can make the tester readings wrong? Can P or K or
other chemicals do this?

Thank you very much
Simone Vicini (psvicini at mdnet_it)