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When you buy through our links, we may earn a commission. Learn more› By Bianca Alba After a new round of testing, the Njoy Pure Plug remains our top pick. With the proper preparations ...

Buoyed by the post-election stock market rally, Plug Power ( PLUG -3.46%) stock ran up to a recent high of $3.15 on Jan. 6.

Instead, get yourself an affordable spark plug socket and do it yourself in your garage or driveway. Like shopping for other tools, choosing the right spark plug socket might come down to personal ...