The Extech DT300 Laser Distance Meter accurately measures from 2" to 164' and can calculate area and volume. The integrated Pythagoras theorem also allows for the user to take indirect measurements. Other features include continuous measurement function with Min/Max distance tracking updates every 0.5 seconds, addition/subtraction, and front or rear edge reference. The DT300 has a double molded housing (IP54), low battery indicator, auto power-off function, and it is easy to use.