Test kits variance

[ryanrid]

I have an elos cal test and the hanna cal checker and am getting a variance of 80, which is more accurate? May also get a salifert to verify.

 

[GhostCon1]

The Hanna calcium checker is wildly inaccurate unfortunately.

You can read lots of reviews and suggestions on making it correct here:
http://reefcentral.com/forums/showthread.php?t=2050181