???6 Button 7 Functions? UNITS- Switch metric/imperial system, HOLD- prevent deviation, MEMORY- Viewstored, SAVE- Store 5 datas, CLEAR- one key to zero, POWER- Power on/off, open/close backlight. All buttons are IP54 waterproof and dust-proof. Durable button-The number of keystrokes is limited to 1 million times ???Accurate to 0.03?Rare high-precision digital display measuring wheel on the market. The unit of measurement has FT / IN / M / CM / ' / " .Can be used by professionals. Adopts a precise gear structure design. the forward count increases, and the backward count decreases, effectively avoiding errors. ???PORTABLE Features?Through 2 tims folds can be folded to 16 inches into a backpack(included) for easy carrying and transport. Unfolded it extends to 40 inches. Stronger bracket, Perfect joints, Threaded TPR tires, Increased friction, Original location marker, carrying bag. ???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 PROCESS?Whether 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.