The utility model relates to a survey line appearance field specifically is a LAN interface survey line appearance of roll coil of strip chi, open the main test instrument who has main RJ45 slot including one end, the supplementary test instrument who has subsidiary RJ45 slot is opened to one end, is equipped with coil of strip ruler box in main test instrument's the other end, and this coil of strip ruler box is inside to be equipped with from the banded measuring tape of the steel of the formula of rolling up, and the tooth hook of the banded measuring tape of steel is located main test instrument's other end lateral surface. LAN interface survey line appearance has the function of measuring net twine length concurrently, and tooth hook is located the main test instrument one end of keeping away from main RJ45 slot, hides usually in main test instrument, does not influence the normal use of survey line appearance, when net twine length is measured to need, draw get the tooth hook operation can, simplify the maintenance of room maintenance personnel and inspect the required equipment that carries, convenient and fast.