Measurement Distance:0.1m ~ 60m (4 in ~197 ft)

This a laser meter not the cheaper Ultrasonic type distance measurer.

Features :-

Very Accurate - In 60 meters range, the measurement precision can reach 1.5 mm
Light and handy - Product net weight (including battery) is only 100g
Long battery life - Each group of new battery can measure up to 5,000 times

UT391 has the following measuring functions

Display illumination - suitable for working in darkness situation
Multi- types of units display- m/in/ft/m2/ft2/m3/ft3
Continuous measurement, tracking function - suitable for staking out any distances
Minimum distance measurement - allows horizontal or vertical measurement in which the shortest distance is auto mantically displayed.
Maximum distance measurement - allows diagonal measurement into corners in which the longest distance is automatically displayed.
Plus, minus - distances, areas or volumes can be added or subtracted.
Area and volume measurement - the area or volume is automatically calculated from two or three measurements (length, width, height). Supplementary information such as circumference, wall area, floor or ceiling area are displayed at the touch of a button.
Pythagoras functions - allow distances to be determined when direct measurement is impossible. The distance is automatically calculated from two or three measurements.
Memory Storage - save the value of previous 20 records for measurements or calculated results.

Technical Specification

Measurement Distance 0.1m ~ 60m (4 in ~197 ft)
Measurement Speed 3time/s
Battery Type 2xAAA (1.5V)
Battery Life up to 3,000 measurements
Dimension 116x49x28mm
Weight 100g(including batteries)
Laser Type 635nm, < 1mW
Dust Protect/Splash proof IP54
Auto power off after 3 min
Auto laser switch-off after 0.5 min

Package includes a carry case

12 months return to base warrenty