Measuring devices (such as ammeter, speedometer) are spelled "-meter" in all variants of English., s.v. ammeter, meter, parking meter, speedometer. The suffix "-meter" has the same Greek origin as the unit of length., s.v. meter.
measuring devices (such as ammeter speedometer) are spelled "-meter" in all variants of english sv ammeter meter parking meter speedometer the suffix "-meter" has the same greek origin as the unit of length sv meter