I use a Dremel tool with a cut-off wheel to spark test. Up to this point, I don't have any use for an angle grinder, so no use running out to get one. Just don't buy the Chicago Electric knock-off from Harbor Fright (pun intended), it doesn't have enough "oomph" to use for spark testing. Besides, the one I had died after six months, so instead of getting a free replacement I bought the Dremel at Walmart.
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