Main features
1. Distance/ Area/Volume measurement.
2. Pythagorean proposition indirect measurement
3. Single/Continuous measurement
4. Addition/ Subtraction Measurement.
5. Units and benchmark selectable.
6. Automatic horizontal and vertical
7. battery is not include
Applied range：
* Used for interior design and decoration technology filed.
* Construction supervision & on-site detection function.
* Real estate, fire control and assessment of industry planning.
* Public facilities use.
