1. With Data Storage:This almighty tools tape measure has various kinds of measurement functions including single/continuous measurement, area measurement, volumes measurement, and Pythagorean measurement. Equipped with historical data memory function 2. & Comfortable: Tape measure has high-impact rubberised ABS case for a firm grip. And includes a buckle, can be interspersed belt, shoulder belt, backpack belt, etc, easy to carry 3. With Self-Locking Device:3-in-1 Tape Measuring Tool automatically lock the current measurement position after the tape is pulled out, press the unlock button to automatically rebound the tape, more r and will not hurt your hands anymore 4. Versatile And Convenient:The digital tape measure ruler allows you to easily measure distances and mark points accurately, saving you time and effort