Power factor panel meters, AC voltmeters, current shunts, AC current probes, sweep generators, network analyzer calibration kits, resistance bridges, guarded potentiometers and logic analyzer probes. Makers include Wiltron, Dranetz, HP and Leeds & Northrup. An electronics technician, a calibration lab or a restorer of vintage bench instruments can fill a gap on the bench here.
More instruments are in Test & Measurement Equipment.