1High Definition Digital Display: Data display can be accurate to millimeters avoiding errors that may caused by visual calibration, the data observation is more intuitive 2Real Time Display: When using the continuous measurement mode, the tape measure will update the data in real time, suitable for non planar distance measurement, continuously scan the real time distance 3Dual Photoreceptor Holes: Significantly improved stability and increased light input in complex environments 4Self Locking: This measurement tool is easy to use without hurting your hands, lock the current position in real time when pull out, and press the button to retract 5Application: This laser tape measure is suitable for household, building, industrial ranging, the maximum measuring distance is approx.40m/132ft