I think this product is great. It is very compact and easy to carry in its case. I am not sure of the accuracy as sometimes the readings vary significantly within seconds of each other. I find that the battery life is adequate. I have not changed the batteries in the 2 1/2 months I've owned the machine and I have used it 1 to 5 times each day during this time. I wonder if it can be connected to a computer to download readings?