Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Do not buy

I needed a new hygrometer for my humidor. I ordered this one because it was a great price. I was never able to properly calibrate it as the adjustment knob never worked. I decided not to calibrate it and stuck it straight in my humidor. After it was in there for about 20 mins, it read 99% humidity and then shut off and never turned back on. Do not buy. Spend the extra money and get a better product.