Measure one hole, press zero, then measure across the outer edges of both. The caliper has already subtracted the hole diameter, so the number on the display is the center-to-center distance.
Switch everyday one-handed tasks — brushing your teeth, and anything else you normally do with your dominant hand — to your other hand for a month or two. Building that off-hand coordination carries over to steadier control when welding or cutting from an awkward angle or side.
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