Instruct: Classify Amazon reviews into positive or negative sentiment
Query: short battery life

Just be aware that you will need to replace the batteries in this air gauge. I've had this gauge for 18 months and it worked fine the first two times I used it. The third time I tried to use it the batteries we dead. $15.00 to replace them. I threw the unit away and purchased an analog device. If you're willing to be without it when you need it and willing to pay through the nose for batteries, this unit will be fine for you.