laser measure, dtape 328 feet digital laser tape measure m/in/ft unit switching backlit lcd and pythagorean mode, measure distance, area and volume - hand strap and battery included dt100 dtape <p><b>product specifications:</b></p><p>model:dt100</p><ul>measuring range: 328ft / 100m</ul><ul>distance measurement precision: ±1/16 inch(±2mm)</ul><ul>units: m/ft./inchs</ul><ul>display: 2.0 inche large lcd backlit</ul><ul>max storage: 20 units</ul><ul>laser level/type: class ii/635nm, <1mw</ul><ul>battery type: 1.5v 2*aaa(included)</ul><ul>auto laser power-off: 20s</ul><ul>auto power-off: 150s</ul><ul>date storage: 20 groups</ul><ul>manually delete unwanted data</ul><ul>6 units for selection</ul><ul>automatic calculation of area and volume</ul><p><b>date storage up to 20 groups</b> <br></p><p>supports data hold and data clear function, supports data store/recall function. <br></p><p>measure anywhere</p><p>measured directly, by using the pythagorean theorem (a2+b2=c2).</p><p>area measurement</p><p>dt100 can calculate the area of a square or rectangular room or space by measuring its length and width and multiplying the two values.</p><p><b>tipps:</b> <br></p><p>1.as strong sunlight would weaken laser energy, which might influence the accuracy and measuring range, so we recommend you to avoid using in a direct sunlight. <br></p><p>2.if have to use, we kindly recommend to put a smooth and opaque reflective plate at the target to improve the stability and accuracy of measurement, because the more smooth and opaque the surface is,the high reflectivity would be. it means the more light will be returned and the more easily it will be received by the laser measure.</p>