Feature:1. 6 BUTTONS 7 FUNCTIONS: UNITS to switch metric or imperial system, HOLD to prevent deviation, MEMORY is Viewstored, SAVE for store 5 datas, CLEAR means one key to zero, POWER is power on or off, open or close backlight2. ACCURATE TO 0.03: Rare high accuracy digital display measuring wheel on the market. The unit of measurement has FT, IN, M, CM, ', ". Can be used by professionals3. PORTABLE AND LONG LASTING: Digital display measuring wheel support 23IN~40IN expansion length, after shrink to 23 inches can be put into the backpack we give away. All buttons are IP54 waterproof and dustproof. The number of keystrokes is limited to 1 million time4. MULTIPLE APPLICATIONS: Distance measure is sufficient for various indoor and outdoor projects, rolling measuring wheel is ideal for appraisers, law enforcement, construction, or landscaping workers, and homeowners alike. surveyors, crime scene, and all other measuring professionals5. 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 make the whole surveying process fun and easy, This wheeled measurer is sturdy and lightweight; So stop overworking we got you covered on this oneSpecification:Item Type: Digital Display Measuring WheelUnit: FT, IN, M, CMMaximum Measurement: 100000FT/MFunction: MEMORY, UNITS, SAVE, CLEAR, HOLDBattery: 2 x AAA alkaline batteries(not included).Package List:1 x Measuring Wheel1 x Storage Bag1 x User Manual