M3 - Multimeters, VTVMs, Voltage standards
AVO, GB Model 8 AvoMeter Multimeter, universal, moving coil
AVO, GB Type H AvoMinor Compact multimeter
Chinaglia, Italy PVT 410 Tube tester and multimeter, 5 kohm x volt
Cropico, GB SC-2 Dual Weston standard cell, voltage reference
Dana, USA 5900 5 digit precision multimeter
Eppley, USA Eplab Student's Cell Weston standard cell, voltage reference
Eppley, USA No. 100 Weston standard cell, voltage reference
Fluke, USA 540B Thermal transfer standard
Guildline, CDN 9152-12 Voltage reference, 12 thermostated Weston cells
Guildline, CDN 9152T6 Voltage reference, 6 thermostated cells plus thermometer
Hewlett-Packard, USA 410B Vacuum tube voltmeter
Keithley, USA 660A Differential voltmeter
Military AN/PSM-37 ME-418 Multimeter tester
Military TS-297/U Compact multimeter
Muirhead D-402-CP Weston reference cell
Muirhead K-375-C Weston reference cell
RCA, USA WV-98C Senior Voltohmist, vacuum tube voltmeter
Sangamo-Weston, GB Model E772 Analyzer Multimeter tester
Shallcross, USA 673-D Milliohmeter
Tinsley, GB 1149 Dual Weston standard cell, voltage reference
Weston, USA Model 4 Weston standard cell, voltage reference