I bought a new KHD today and unfurtunately the valeau it show is way different than expected.
In the time my old khd was defect and the new one is delivered I use salifert (what I calibrated with th KH 7,5 fro GHL)
For so far i checked the KH in my tank is 7,9. the new derictor comes with 5,9, 6,0 and 6,2 in three mesuarments .

Is this something you guys recognize?