It is made of high quality ABS material, anti-earthquake and anti-drop, waterproof and dustproof, durable and portable. According to the measurement principle, the Pythagorean theorem indirectly measures the measurement results, addition and subtraction operations. Widely used in construction and industry, especially in rooms, apartments, buildings, factories, warehouses and other large areas. Easy positioning with bright laser pointer, supports outdoor OD mode and smoothing function. Large LCD screen with backlight and multi-line display of measurement results for easy reading and recognition.