US Patented DesignPatent No. D927334. MULTIFUNCTIONAL FtMeters5 Buttons 6 Functions in Control Center with the backlit display on topmounted. Power on and off; Switch metricimperial system; Store data; Read data; One key to Zero; Brighten display; PORTABLE FOLDABLEhandle folds in tri and has a builtin carrying handle making it easy to transport and store in the backpack included. Unfolded it extends to 40 and it folds down to 16.The handle features a large, digital LCD screen with a backlight for easy viewing. All buttons are waterproof and dustproof. EASY TO USEDisplays your measurements clearly by easily rolling our measuring wheel, and you can keep 100 track of your measurement distances anytimeSM. The handle features a large, digital LCD screen with a backlight for easy viewing and the memory RM can store and recall up to five values. MULTIPLE APPLICATIONS Distance measure is sufficient for various indoor and outdoor projects, Rolling measuring wheel is ideal for real estate appraisers, law enforcement, construction, or landscaping workers, and homeowners alike. surveyors, crime scene, and all other measuring professionals; INTERESTING MEASUREMENT PROCESSWhether private or industrial purposes, the measurement of straight line and curve line is easy. you can measure any type of distance just by walking with such a measuring wheel device makes the whole surveying process fun and easy, This wheeled measurer is sturdy and lightweight; So stop overworking we got you covered on this one.