I've been using the OneTouch Verio for several months. Anytime I get the "control solution" reading for a blood test and/or it turns off prematurely I change the batteries - fixes the problem every time. Don't waste strips and keep testing when control solution displays in error - I learned the hard way and wasted a lot of strips. The batteries that originally came with my meter didn't last long either. Wish it had a battery life indicator, but other than that I love this meter.