The ES9010 standard resistor consists of nine high-precision, military-grade wirewound resistors connected in series. It is designed for ease of use, allowing direct shifting between resistance values without the need to change wiring. This unit is specifically customized for the calibration of grounding resistance testers, equipotential testers, and other metrological instruments. With a maximum accuracy of 0.05%, it serves as a portable and efficient replacement for traditional single resistors like the BZ3 series.