Accurately LCD Digital Laser Hand Held Ultrasonic Distance Meter W/Laser PointerDescription:This 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. The 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:100% Brand new and high qualityLCD with BacklightArea， volume， addition， subtraction calculationAuto OFF: switches off if you do not press any key for about 4 minsYour distance measurer transmits ultrasonic waves to a point you want to measureIt measures the time taken by the waves to reflect and then calculates and re-transcribes the distanceClearing of memory function: allow you to delete quickly all the measures storedCorrection of errors: the distance measurer indicates that a distance measured is either too long， or too shortPower supply: 1 x 12v Alkaline Battery(batterynot included)Specification:Measurement Range: 0.5m~18m (1.5ft ~60 ft)Accuracy: ¡À1cm (¡À0.5%£©Resolution:0.01m or 0.5feetMeasuring units: meter and feetFrequency: 40kHz (ultrasonic pickup)Working temperature 32 F to 109.4 F ( 0 'C to 43 'C)Laser beam: Wattage 1mW (mW =milliwatt)Package Included:1 x Digital Ultrasonic distance meter1 x User Manual