Is Dr. JD.COM's infrared measuring instrument genuine?

You mean the laser ruler, don't you? baike/view/3887533.htm You can go here and have a look. There is a working principle of the laser ruler in it, and the price varies, depending on how big you want to measure. If you decorate your home, you will feel a little overqualified, and the error of using a tape measure will not be great. In CAD, there will be no big problem if all the errors of the home decoration drawings are not more than 3 cm.