AEMC BR07 [2131.25] Resistance Decade Box with 7 Ranges, 1-10MΩ. The Resistance Decade Box Model BR07 is built into a metal bench top box. It is used for testing and calibration of test equipment. The main function of the Model BR07 is to create a resistance with a specific value by using a combination of the rotary decade switches. The Model BR07 has seven decade ranges from 1 to 10MΩ. The Model BR07 is equipped with Ø 4mm safety terminals for connections. It is designed to EN 61010-1 safety standards. Includes ground jumper lead.