Using a laser to make measurements sounds futuristic and can only be found watching a sci-fi movie. But in this day and age using a laser to measure things like distance, area, and volume is very practical.
And using a laser for measuring is more accurate than using a regular tape measure. The reason is because a regular tape measure usually warps over time, giving you inaccurate measurements. But with a laser tape measure it is accurate the first time you use it and will still be accurate from ten years from now.
If the batteries in the device are good then you will get an accurate measurement every time you use it.