Beyond frustrated with this thing. I have now tried it 4 times and it does not sent me a gravity reading, just continues to read 1.004. According to the instructions I should take the [SG] out of the name, which I did. I cut and pasted the formula directly from the sheet I was given. I know it works because the first time it worked really well and was fun to watch the fermentation. The last 4 times it hasn't done anything. I am sure it is user error, but I think I have had it with this thing. Anybody interested in it, I bought it for 50 bucks shipped and would be willing to sell it for what I bought it for. If not, it will probably sit in the closet with all the other crap I bought that has not worked out. Thanks for looking.