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It has a limited distance range, which I have found to be about 20 feet. This measuring device is compact, easy to use, and uses one 9-volt battery. Beyond that, its reliability gets dicey.
I was pleased to note that the unit's laser bounces off glass as well as walls. I like the SF and volume measurement as well. I highly recommend this item. I am very satisfied. The fact that it does two way straight line eliminates the 50' limit problem. The only minor problem is that at 50', the reflective service must be significantly large; can't use a friend holding a note book.
The only reason I didn't give it 5 stars is because the switch button is too easy to press, which means it can be turned on while inside a bag and waste battery. It's a great product and certainly does the job it's intended to. I got a little protection for it and don't have this problem anymore.
But it does not work well if the surface is not hard and somewhat smooth. I measured a short space and I got a couple of inches error. Product is useful and easy to use for quick/rough estimates. it is also not very accurate.
Good for basic measuring with big solid walls or structures. Not good for narrow beams or such.
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