Quote:
Originally Posted by zeno
Hint
When measuring high ohm resistors lift one end & use clip leads
to test it. If you hold on both ends you add your body resistance
in parallel, throwing off your measure.
73 Zeno 
LFOD !
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I know some guys will measure them in-circuit and not touching probes, particularly RCA tube sets with PWB-mounted resistors, then clip from top and replace if it measures other than marked.