I ordered this product for three main reasons - low price, two leveling windows and its laser display. I needed this for an accurate measurement which this product cannot. The difference was 0.5 to 1 inch depending on my testing methods compared to measuring with a steel tape measure. As an alternative I bought a better known branded laser meter which was twice the price of the HD but at least I have accurate readings now. I do not recommend this product simply because it does not fulfill the basic functions of an accurate measurement. The measurement was useful for measuring the surface area of a flat floor. The second plane is useless when measuring against walls or vertical surfaces. I do not recommend this product.
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