Product review (5 stars): Good for the price.
Great for the price. I have purchased over 20 of these units. Some have malfunctioned and provide inaccurate results. I have sat a few side my side and found them for the most part in sync. The two that malfunctioned were out of the return period and the cost of shipping back made no sense. I moved the next purchase to more expensive units and they seem to be okay.