Calculates areas and volumes for paint, wallpaper, tiles, size of air-conditioning units and radiators. Memory function, auto power off and low battery indicator. Specifications: Measuring Range: 0.6m-18m. Accuracy: +/- 0.5% +/- 1 digit. Aperture angle: +/- 5°. Calculation range: Length 99.999m, Area 420.25m?, Volume 8,615.1m?. LCD Resolution: 0.01m. 4 x 1.5V AAA batteries supplied.