Differences of glucose measures

I am type 2 diabetic, for 10 years.For a few years, I am fasting the fasting glucose every day.I've been a season that has begun to appear higher than normal,

160, 170 ...

This morning again, so I measured the glucose at night when I got home and left me 185.

It seemed very high for everything I moved this afternoon.

And I started distrusting the meter so I tried another old one, and gave me 150 ...

It seemed more normal.

I have a Safe aq smart,

Thinking it was reliable.

How often do you have to change them?

Do they lose precision?

Which are the most precise?

Well, totally precise there are none .., I may make two measures in a row you also find some difference.

The only exact data is given by the analysis on an empty stomach and glycosylated hemoglobin, which indicates if you need another treatment.

In the ambulatory they will give you a reliable glucometer.They usually have bayer, menarini ..