Some interesting features.

His old Fluke 187 meter has a “nS” mode (nano-siemens) which can give crazy high resistance measurements (up to 100 GΩ) as conductance measurements.

His Fluke 87V has a low pass filter on its AC voltage input.

He explains Lo-Z mode and phantom voltage. It works by putting a thermistor across the input leads.

His old Tekpower TP8250 analog meter has a D.Ω range for measuring low resistances and a NULL mode for indicating voltage direction. His Sanwa EM7000 also has a NULL mode facility.

His Tekpower TP8250 also has a battery mode, which will measure the voltage from a battery with a load attached.

His ANENG AN870 has a Non-Contact Voltage sensing (NCV) mode which does what it says on the tin. My NCV device is a Fluke 1AC-C2-II VoltAlert Voltage Detector.