And a great one at that. I use this handy device when I am out surveying sites which calls for room measurement. Many times our clients time is limited and the IntelliMeasure provides a quick and easy way to get the information I need. I have used a couple of ultrasonics in the past that have ended up in the trash, no accuracy or reliability. This one will be a keeper. It is definitely not a replacement for a tape measure but provides great accuracy at +/-.5% for estimating and that is what it is designed for.