Hi Carl
Regarding spectrophotometers & flicker meters I personnaly prefer Gossen Mavospec Base ergonomy, more on-set use oriented and quicker to use.
UPRTEK are also accurate spectrophotometers (same accuracy than Gossen spectrophotometer), but more laboratory and industrial production oriented.
I mainly check flicker main frequency, for safe shutter speed and frame rate calculations, flicker percent et flicker waveform to estimate if flicker amount is high or low.
Hope it helps...