Ultrasonic Distance Meter Measurer The ULTRASONIC DISTANCE METER + LASER POINTER is a perfect tool to quickly know the distance， area and volume of a room! It can measure distances in a straight-line from 0.5m to 18m. Your distance measurer transmits ultrasonic waves to a point you want to measure. Afterwards， it measures the time taken by the waves to reflect and then calculates and re-transcribes the distance Features:● 1.100% Brand new， high quality● 2.LCD with Backlight● 3.Your distance measurer transmits ultrasonic waves to a point you want to measure● 4.Auto OFF: switches off if you do not press any key for about 1 min● 5.It measures the time taken by the waves to reflect and then calculates and re-transcribes the distance● 6.Level function（one vertical level bubble， one horizontal level bubble） Specification:Measure distance from 0.5m to 18mAccuracy +-0.5% +-1cmResolution 1cm or 2\1 inchUnits of Measure : Feet/Meters Package Included:1 x Ultrasonic distance measurer (Battery is not included)1 x English User Manual