Hello all: We have a fine 576 with the pulsed high current test fixture and many adapters.
One unusual use has been testing gas discharge lamps, Telecom protection spark gaps, neon, etc,
Set on AC, 0.5 or 2.3 W, up to 1500V
No base connection needed. Gas Breakdown voltage and ON impedance are easily checked.
Another use is checking LEDs,
There are some that are very high power and others that are prototype tubular filament LED.
Like a diode but with many series junctions, so voltage forward can be 30-100V.