3 in 1 Digital Tape Measure, MiLESEEY 40 M Laser Measure Device with Mobile Phone App, Real Time Digital Display, Unit Ft/Ft+in/in/M and Pythagoras Mode, Measure Distance, Area and Volume (40m-app) :
2 in 1 Laser Tape Measure Review / Testing for Range, Accuracy and General Awesomeness. - YouTube
How does a laser tape measure work? | HowStuffWorks
5m Tape Ruler Distance Meter3in1 Digital Laser measure 40m/131Ft High Precision | eBay