my hp 3458a is for sale. it has lowered temperature of the reference for better stability and is fully calibrated for both ac and dc. the digital board is the version with one eprom and dallas rams. the dallas rams are in sockets. i can provide a backup file of the calram.asking price is 3500 eur. Regards Frans info@ElectronicsAndBooks.com http://ElectronicsAndBooks.com Netherlands Discere ne cesses