uMeasure Rebzar MS-100 Precise and Portable Laser Tape Measurer (0.2 mm, 100 m/321 ft) emstrongHow it Works:/strong/em A Laser Distance Meter sends a pulse of laser light to the target and measures the time it takes for the reflection to. emstrongWhy Not Tape:/strong/em A Laser Distance Meter is on every count eg- speed, accuracy, safety, versatility, convenience, and functionality. emstrongWhere to use:/strong/em All Kinds of measurements in construction, Length, Area of non-verticle lines.