The current drawn from the power supply is also a good indicator, ideal current on UHF TX on min RF? is aroubd 2.5 Amps, at 50 Watts expect 12-15 Amps on FM or CW. PA is around 50 % efficient.
Most ham shacks should have what I call the minimum amount of kit:
Power supply 30 A with Voltage and current meters. Also a small variable 0 to 30V 2Amp with current limit.
DVM I/P to 20 A and 1 mV/A 750V AC/ DC
Oscilloscope 100MHZ? bandwidth (very cheap now days)
SWR meter or and an ATU that is metered?
50 ohn load 100 watts
Tina SA Spectrum Analyser (?60)
SDR RX SDR Play 1A
SMA, Pl259, BNC and N adapter set
Various hook up cables
With the above list you can repair and fault find a lot of radios, all costing less than one rig!!
73 Andrew G8UUG
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Andrew Lenton