This morning, I had a FBS of 6.1 - which for me so far is low ! huzzah I thought - then decided to check again. In the space of less than five minutes my BS tested as 6.1, 7.1, 7.8, 7.5, and 7.3.......I'm a bit new to this so was wondering is this normal, is it the machine (I've done a QC test)...