I am having the same problem after applying hair conditioner to the bottle as an anti static and wiping the tips....the salt test is usually about 700ppm above what I know the salt level to be from a goldline salt meter calibrated with a 3200ppm standard from goldline and also from the aquacheck salt test strips that consistaly test within 150 ppm of the goldline meter. Ben is still working on fixing the problem and I believe he is getting close from the last PM I got from him on the subject.