Red Sea Test Kits Acuracy???????

[mjslaugh]

So I am doing my weekly water change on my tank, and before I do it I decide to run a set of test and the results were no amonia, nitrite, nitrate, or phosphate. I have a ph of 8.2, a dkh of 10.9 and alk of 3.89 as well as a calcium of 560 with the salifert test kit, that seemed high so I decided to pull out the red sea calcium kit and it registered just below 400, so my question is has anyone else seen that much of a margin of error on a red sea test kit?? Oh and I didn't think to run another salifert Ca test before the water change and now I don't have a baseline to eliminate the 'human element'.

 

[Boomer]

All RS kits, IMHO, belong in the circular file

 

[mjslaugh]

All RS kits, IMHO, belong in the circular file

I do agree, that is why I am transitioning over to salifert for everything, but I couldn't help myself, I read 480 last week with salifert, and then a jump to over 560 without dosing anything??? I am going to test again tommorow and see where it lies, I am kinda thinking I just screwed up the sali test.