xDevs.com | HP 34401A repair and calibration worklog
HP 34401A Multimeter Service Guide
Second Hand Original American Hp34401a Six Digit Half Table Digital Multimeter Is Not Refurbished. See The Test Standard Source - Instrument Parts & Accessories - AliExpress
HP 34401-90013 34401A Multimeter Service Guide | RecycledGoods.com
Agilent / HP 34401A Benchtop Digital Multimeter, 6 1/2 Digit , Used
GitHub - openscopeproject/HP34401a-OLED-HW: HP34401a DMM OLED display mod hardware