★ Design: Featuring an LED display with a backlight, our ruler provides clear measurement data even in dim-light environments, ensuring optimal visibility at all times. ★ Tape Measuring: Ranging Meter, 5m Tape Measure, and Cross-marking，all included. Effortlessly Measuring High Ceilings And Other Hard-To-Reach Areas With Just The Touch Of A Button. ★ Versatile And Convenient: The digital tape measure ruler allows you to easily measure distances and mark points accurately, saving you time and effort. ★ 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 safer and will not hurt your hands anymore. ★ Accurate Measurement & Widely UseSuitable for road engineering, housing, construction engineering, water conservancy engineering, electric power engineering, pipeline engineering, etc.