1.Bi-Directional Distance Measurement
2.Automatically Convert Unit of Measure
3.three different units of measure:
 Meters-Centimeters  M-cm
 Feet -100 TH.    FEET
 Feet-Inch    ″
4. Auto Power-OFF
Measuring diameter : 318.4mm
precision : ± 0.50%
display accuracy : 0.01M