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 backlight 2. 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 professionals 3. 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 time 4. 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 professionals 5. 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 one Specification: Item Type: Digital Display Measuring Wheel Unit: FT, IN, M, CM Maximum Measurement: 100000FT/M Function: MEMORY, UNITS, SAVE, CLEAR, HOLD Battery: 2 x AAA alkaline batteries(not included). Package List: 1 x Measuring Wheel 1 x Storage Bag 1 x User Manual