Assess students' recall of the seven SI base units and symbols (meter, kilogram, second, ampere, kelvin, mole, candela), common metric prefixes and powers of ten (kilo, centi, milli, micro, nano, mega), and essential metric–imperial conversion factors for length, mass, and volume (e.g., inch–centimeter, foot–meter, mile–meter, pound–kilogram, ounce–gram, US gallon–liter). Tasks emphasize identification, symbol use, and straightforward numeric conversions; no advanced derivations.