The Ermenrich Reel GE40 laser measuring device is a practical, multifunctional measuring instrument for building, repair and construction work. With its help, you can measure distances of up to 40 metres and calculate areas, volumes and angles. If you need to measure under difficult conditions, the Pythagorean theorem helps you to calculate the distance from intermediate measurements. The display shows 4 lines of high-contrast, easy-to-read figures. The integrated memory stores up to 99 groups of previous measurements. The device is powered by standard AAA batteries. One set of batteries lasts for approximately 5,000 measurements. To save energy, the laser switches off automatically after 30 seconds and the device switches off after 180 seconds. There is a battery level indicator. You can use the measuring device to take single or continuous measurements, add and subtract measurement results and change the point from which the distance is measured.