Instruct: Classify the given review as either positive or negative.
Query: your common sense measure UV index better than this one

the product we got is defective. the liquid display can only show partial of the digits. If you try to measure uv index behind window glass, it always shows 0, no matter how strong the sun is, which doesnt make sense to me.As for the UV index measurement, it always show me 2 levels below what the weather forecast says and it doesnt tell you more than what your common sense can tell you.Additional comments on 2012:For those who need uv protection, especially those who have medical conditions, please dont be fooled by the comments made on this review. Regular glass will NOT block uv light, neither does cloudy sky. What does your doctor tell you? Dont drive between 10am-3pm if you need protection. Why do many cars have "uv blocking window glass" (toyota highlander etc) if regular glasses can block uv?Believe them at your own risk (actually one comment said he got rashes after long driving, so did some of my friend)