3 Syllablesgeometer
4 Syllablesaerometer, barometer, bathometer, bolometer, chronometer, clinometer, cyclometer, cymometer, drosometer, gasometer, hodometer, hydrometer, hygrometer, lactometer, manometer, micrometer, nitrometer, odometer, pedometer, phonometer, photometer, piezometer, pyrometer, sonometer, spectrometer, speedometer, tachometer, tintometer, tonometer, tromometer, udometer
5 Syllablesanemometer, audiometer, declinometer, dynamometer, electrometer, eudiometer, galvanometer, goniometer, inclinometer, magnetometer, pluviometer, radiometer, variometer
6 Syllablesalcoholometer, interferometer, potentiometer