Enhanced Measurement Functions--- Single/continuous measurement, area measurement, volume measurement, and Pythagorean measurement within your fingertips. Easily measure high ceilings and other hard-to-reach areas with the push of a button. With Self-Locking Device-- This Laser Tape Measure Cross Laser Line Has A Self-Locking Device, Which Automatically Locks The Position After The Tape Is Drawn Out. Automatically Retracts By Pressing The Unlock Button. Accurate Measurement--- 3-in-1 Infrared Laser Tape Measuring Can Be Used For Measuring Foundation And Foundation Levelness, Installing Construction Equipment, Precision Testing, Testing Bearings, Checking Automation And More. With Data Storage--- 3-in-1 Infrared Laser Tape Measuring Has A Storage Function Inside. Can Store Up To 20 Sets Of Data. It Can Be Called Up For Viewing And Storage At Any Time. You No Longer Have To Worry About Not Being Able To Find Recorded Measurement Data Or Losing Data. Convenient to Use-- This Product Can Measure Area, Volume And Pythagorean Single-Time/Continuously. At The Same Time, It Has High Elasticity And Toughness, ABS+TPR Shell, Non-Slip And Drop-Proof.