<a href=showthread.php?s=&postid=13005902#post13005902 target=_blank>Originally posted</a> by SCIFI_3D_zoo
Everything is calibrated properly. It's just that swingarms are totally unreliable. A lot of pH kits are totally unreliable. I did it again last night and that Red Sea pH keeps saying 8.1. It's not, it's 7.67. Salifert is not perfect either.. I have "heard" their ALK test is not accurate. pH, salinity, ALK, these are not things that can be just a "little" off. 8.1 to 7.7 pH. 1.025- 1.029 salinity. THis is killing stuff in my tank b/c of these crappy kits. The Salifert comes with a ALK calibration fluid too. I think the moral of the story here is... buy a Refractometer, Pinpoint pH kit, and everything else you can get calibration fluids to verify their accuracy. Otherwise, don't trust these kits. I also heard that in general most kits or all don't do pH very well.