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• This devise is fitted with a sensor receiving instrument at the part of red dot. When you target the point depend on any plane and push the button, the sonar send out signal and receive them when it bounce back. The distance will sends feedback to the user, and the number will appear on the lens.
1.V-structure is a great shape to help the user keep the measuring process consistently vertical line down to the goal.
You can measure the height when you put it lying on its back.
2.The instrument may be used in any position even to measure the height which is difficult for the traditional tape ruler, and is much more conveniently portable.