Hammer _ Digital Branch of the Instrument (certified) _ Hammer provided by Qingdao Branch of the Instrument Co., Ltd.. Qingdao Branch of the Instrument Co., Ltd. (www.qdjk17.com) is specialized in the "mapping equipment, analytical instruments, testing equipment, flow meters, optical instruments, temperature instruments," the enterprise, the company of "honesty, hard service" concept, to provide you with the highest quality products and services. Welcome to inquire! Contact: Li Yongjie. Laser rangefinder to use: direct measurement of distance: first press the laser (note not facing the eye), targeting and then click to complete the distance measurements. Indirect measurement of distances: can indirectly measure the height of the front wall of the Pythagorean theorem. Measured area / volume: Use the space calculation function can easily calculate the area and volume of space. Splash measure: Thanks to IP54 protection grade design that allows you to operate freely in the construction site in a variety of harsh environments. Use before using geological compass declination must be corrected. Because the location of magnetic north and south poles of the south and north poles and geography are not entirely consistent, ie the magnetic meridian is not coincide with the geographical meridian, any point on the Earth's magnetic north to true north direction is inconsistent with that point, the angle between the two directions called magnetic declination. East of the northern tip of the needle at a point on the earth somewhat north direction is called the East side, west side, said the West are somewhat biased. East bias is (+) Western bias of (-). Declination everywhere on Earth are calculated periodically if known declination of a point, the relationship is a test line of magnetic azimuth A magnetic and true north azimuth A is A equals A subtraction magnetic declination. This principle can be applied magnetic declination correction, correction may be rotating spiral Hammer compass scale manufacturers, so the level of the dial to the left or right turn Hammer wholesale business, (the east side of the magnetic declination Right, West biased to the left), so that the chassis between the north and south tick compass dial 0--180 degrees with the horizontal wires equal magnetic declination angle. After reading the measurement correction on the true azimuth. Azimuth measurement target compound is the desired product and the determination of the relative positional relationship between the measuring person, that is, the desired product was measured azimuth (azimuth angle refers to an angle clockwise from the meridian line of the survey). When measuring the brake screws Hammer relax, so the objective target plate measurement point on, if the compass toward the northern end of the desired product, the southern tip of relying on their own, to aim to make the desired product, the objective target plate holes, cover glass filaments, for purposes such as target plate holes even in a straight line Hammer manufacturer, while the chassis is centered bubble vial, to be referred to the degree of the compass needle still is the measurement of the azimuth of the target product. (If the pointer is still not the moment when the needle swings readable half the minimum degree at the same time also measure other elements of reading).