Junction box for connecting sensor and weighing instrument. It is usually used in weighing equipment with multiple sensors. It is difficult to make the weighing sensors have the same sensitivity and output resistance value in the production process. Therefore, the actual small adjustment must be made at the installation site. The junction box is equivalent to a passive resistance network, which prepares a precision adjustable resistance for each sensor connected in parallel with the output end of the sensor. When adjusting an adjustable resistance in the box, it is equivalent to changing the output impedance of this sensor. In this way, the output impedance of each sensor used in the weighing system can be adjusted within a small range, resulting in the balance of the large weighing apparatus. Currently available are 4 lines, 6 lines, 8 lines, 10 lines, 12 lines junction box, shell material can be divided into plastic material and immortal oh bar material, but also with lightning protection and explosion-proof functions.