Laser Distance Meter (DT40M)

Extech’s DT40M measures distance up to 40 m 
(131 ft).
It can calculate area and volume and the 
integrated Pythagorean theorem allows the
user to take indirect measurements. 
Other features include continuous measurement 
with min/max distance tracking, 20 point memory,
addition/subtraction of sequential readings,front 
or rear edge reference, and a stakeout function. 
Large quad backlit LCD display and double 
molded housing.
It also has a handy built-in bubble level 
and comes with a wrist strap and batteries.
For more details please refer datasheet.