High Speed Verifier - Addressometer

Speedometers in cars are (allegedly) calibrated to display a higher than the actual speed... to make up for inaccuracies that result from the tire diameter varying with inflation pressure. But it's probably better not to know that.
Unlike the tachometer, High Speed Verifier does not verify high speed, though, it verifies at high speed (though that may be reporting a bit higher than actual speed):
High Speed Verifier is an efficient high speed tool for quickly cleaning large mailing lists of bad addresses. (Windows)