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Measuring low current on high voltages?

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so i have this electric device that can generate about hundreds of kV of electricity, but low currents. i'd say about tens of milliamperes??

i only need to measure the current. i was thinking of simply using my digital multimeter, so sure, my multimeter can take it coz it's rated to go up until 10A. the thing it's fuse is rated up to only 250V??

so, can i simply remove the fuse from the holder and simply short it? since i already know the current is only gonna be within tens of milliamps? if i do so, can i be sure that the high voltage won't damage my multimeter??

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