Precise Measurements – Reliable accurate data which you can rely on, latest Ultrasonic technologyLong Distance – Up To 60 Feet for the even the largest of projectsSmall & Compact – Highly Useful tool in a compact formUltrasonic & Laser Technology – Ultrasonic waves in addition to the laser create a highly accurate measuring toolThis measuring device uses ultrasound to determine distances. It is quick and easy to use and can measure distances in a straight-line from 0.91 meter to 15 meter. There is also a facility to calculate the area and volume of a room. Features: Laser pointer included LCD screen on a luminous background Memory: allows you to measure and to store 3 different measures Addition and Subtraction function: allows you to add or subtract 2 measures. Correction of errors: the distance measurer indicates that a distance measured is either too long, or too short. Power supply: 1 × 9V Alkaline type 6LR61 Battery (Not included) Auto stop: switches off if you do not press any key for 4 min Units of Measure: Feet/Metres Accuracy: +/-0.5% Frequency: 40 kHz (ultrasonic pickup) Range: 0.5m to 20m Dimensions (H-P-l): 115 × 73 × 47mm