Variation of blood suger test

>I am testing my BS (fasting)daily... today it was 118 mg on my left hand middle finger,then i checked the middle finger of my right hand it was 107 mg!!! anybody knows why? is it normal? could the strips or the meter are not working normal? temperature ? 30 C,or 80 F may cause expiration of the strips?<

For home glucose test daily monitoring purposes, 118 and 107 are statistically the same. If the strips are not beyond their expiration date and haven't been exposed to excess heat (direct sunlight or exposure to a heat source in your home or shut up inside a hot car), don't worry about this; nothing's wrong.