1. The ON/OFF: the power switch. 2. M/FT: converting between metric and imperial, such as choosing (M) shows that the data isthe metric system, such as choice Display data is imperial (FT). 3. SM: storing data, press this button displays a window display of data wil be stored within, in totalStore five records,it will display M1,M2,M3,M4,M5. 4. RM: extract data stored in SM, if you exist in 5 meters M1,M2 10 meters,and the current is measured distance is 120.7 M, when you press a RM button it will display the M1 data, and show the "R' at the upper right, R said after the clock display will return to the current measured data. lf you press the RM button twice, it shows the M2 storage of data, and display the "R" in the top right 2 seconds after the show will be back on the measured data. 5. The CLR: remove the current measured data. Press this button will clear the current is measured at a time The data. KEYSTROKE OPERATION 1. The ONOFF the power switch. 2. MFT converting between metric and imperial. 3. SM storing data. 4. RM extract data. 5. The CLR remove the current measured data. 0.3 HIGH ACCURACY This is a rare high precision in the measuring wheel products. The JIZHGRAD digital display measuring wheel has a maximum measuring range of 99999.9mft. Minimum value 0.1mft. DURABLE MATERIAL 0.98 inch diameter thickened steel pipe, high quality ABS plastic, thickened 9mm 0.354in rubber tires, our range wheels have a longer service life. The measuring wheel can be folded and put into a backpack for easy carrying. BACKLIGHT DISPLAY The handle has a backlit digital LCD screen, and the measurement results are clearly displayed, which is convenient for working in the dark. WIDE APPLICATION It is widely used in indoor and outdoor road field measurement, yard measurement, construction site, paved road, sports field and garden curve measurement. You can measure any type of distance just by walking. The measuring wheel is suitable for all kinds of environments grass, concrete, gravel, soil, etc