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This measuring device is compact, easy to use, and uses one 9-volt battery. Beyond that, its reliability gets dicey. It has a limited distance range, which I have found to be about 20 feet.
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 fact that it does two way straight line eliminates the 50' limit problem. I am very satisfied. I like the SF and volume measurement as well. I highly recommend this item. I was pleased to note that the unit's laser bounces off glass as well as walls.
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. 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.
Product is useful and easy to use for quick/rough estimates. I measured a short space and I got a couple of inches error. But it does not work well if the surface is not hard and somewhat smooth. 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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