CP-3009 LCD Handheld Laser Distance Meter with Backlight Ultrasonic Distance Measurer Point 2 to 60 Feet 18M * Infrared principle, accurate measurement of the distance, the laser spot to help targeting * Appraiser assistant, surveying caves, measure the ceiling height, Building Surveying, theater sets, the measurement of housing size, measurement depth, tolerance measurement, volume measurement, public facilities, measurement, level measurement * Suitable for: decoration (such as carpentry work floor, wallpaper the number of required materials, roof insulation materials, paint area), indoor and outdoor measurements * Power supply: 9V battery (not included) * The unit of measure: meters (m) * Measuring range: 0.55m-18.288m (2-60 feet) * Accuracy: 0.5% + 1 * Operating frequency: 40kHz * Operating temperature: 0-43 degree * Laser emission wavelength of 650nm visible laser * Color: black