Is my Alk "stable"

[Dan1789]

I've been playing with my dosers and apex for weeks and weeks now try to dial in my Alk. My ca is steady at 400, trying to get it to 420. My mg is steady at 1350. Here are my numbers for my Alk and tell me if this is an acceptable range, tested within the hour every evening btw.

3-17-13. 8.96
3-19-13. 8.0
3-20-13. 8.34
3-21-13. 8.12
3-22-13. 7.7
3-23-13. 8.2

 

[ritter6788]

Looks good to me. Testing error can be off that much each time.