... Imperial/Metric sele Ultrasonic Range Finder long range finder AR831, 15M SpecificationsUltrasonic Range Finder *Large LCD with ... wrong reading*range finder, *digital range finder, *lectronic range finder, *digital distance meter, *ultrasonic range finder, *range measuring device, ... FEATURES & SPECIFICATIONS AR-831Measuring Range(Metric)0.3∼15mMeasuring Range(Imperial)10inch~50feetMeasure In Imperial ...