The HAMMERHEAD 130 ft. Compact Laser Measuring Tool is the world’s first laser measuring tool that’s compact, accurate, and intuitive. With one simple button, measuring is as easy as point, press, measure. Three modes of operation and two units of measure allow you to accurately measure length, area, and continuous measurements up to 130 ft. /40M with accuracy to ± 1/8 Inch. Other features include an integrated Lithium rechargeable battery and micro USB charging port. Ideal for interior decorating, remodeling, floor and wall coverings, real estate estimation and appraisal. Class II laser product (output ≤1Mw).