Trident Ca and Mg results inconsistent

[gms1234]

Hi all,
Had a trident running for couple weeks now.
My calcium and magnesium results swing wildly with the trident. One day 420, 12hrs later reading 500+. If I do a repeat test the 2nd is usually pretty close to real calcium levels.
I have calibrated 3x. My actual calcium levels are 430 and magnesium is 1360. The alk readings are perfect at 8 +/- 0.05
See graph.

Thanks

 

[Gumbies R Us]

Bumping your post!

 

[TARHEEL78]

What are you calibrating with?