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It's a great product and certainly does the job it's intended to. 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. I got a little protection for it and don't have this problem anymore.
Product is useful and easy to use for quick/rough estimates. But it does not work well if the surface is not hard and somewhat smooth. it is also not very accurate. I measured a short space and I got a couple of inches error.
Good for basic measuring with big solid walls or structures. Not good for narrow beams or such.
Just to note, these are "laser" sighted, but measure with sound, and is the reason for the bell shape on one side.Does a pretty good job and is most useful to measure the height of open rooms that would require a ladder otherwise.Since it does use sound reflection to measure distance, you must make sure nothing gets in the way to make the readings wrong. Now and then if there is a tricky spot to measure, I'll use this on the longest clear shot and finish up the rest of the distance with a tape measure. But no big deal in order to get around a problem area.
I am a Realtor, and in the past I would fumble with a measuring tape when sizing out rooms. With this device I get an acurrate measurement in seconds. It has become a very handy tool of my trade
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