Product review (4 stars): Turns out its pretty accurate because they show the same readings 90% of ...
I was hesitant to review this because I was not sure if the readings were accurate until recently when I got another one to compare it to. Turns out its pretty accurate because they show the same readings 90% of the time and when they vary its only by 1-3 is the difference. So it works great and came with batteries. It would have been better if it had a built in light but it gets the job done.