Southwire AC Tester Analog 120-Volt Specialty Meter...$6.50 at Lowe's...
That was done by the inspector before we purchased the house, and yeah, I did it again myself after we moved in. Only one outlet had reversed polarity, and it was a simple matter of swapping the hot and the ground. There’s no voltage from ground to neutral in the breaker box, so this latent voltage is downstream from the switch only.
Great suggestion.
Great suggestion.