Negative Positive
Title: Worked very well ... for only 2 days!
Review: This is a nifty tool that has a lot of potential, and really should be able to work well even at this low price.In fact, I was able to run tests and get quite accurate and quick results. Definitely needs a hard surface as the target (i.e., not carpet or curtains), but that's easy to arrange.However, on the third day, the unit just said "ERR" with every measurement attempt (normally it only says this for distances under 2ft or soft targets). Replacing the battery with a couple others did not fix the problem (well... momentarily I got one good reading).Oh well. Thanks Amazon for your easy return / refund process!
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