Folks, Had some correspondence with Fluke a while back regarding adjustment of the 752A Reference Divider. They no longer sell the 845AB Null Detector but they have some suggestions on alternate meters to do the job. They also make reference to zeroing the inputs of the detector, which has been a hot topic lately. Here is the link: http://www.ko4bb.com/Manuals/Fluke/Fluke_-_Using_a_DMM_to_balance_752A_Divid er.pdf Best regards, mitch