balance wheel, dial, escapement, hairspring, hand, time-ball

scorekeeper, stopwatch, chronograph, timepiece, chronometer, linesman, referee, assigner, doorkeeper, clock, clockmaker, ref, flagman, metronome, spectator, announcer, measurer, scorekeeping, umpire, pronouncer, arbiter, pinsetter, greeter, scrutineer, tourbillon, horologist, meeter, statistician, stationmaster, horology, clerk, stopwatches, sundial, automaton, grammarian, stenographer, signaler, speedo, gateman, watchmaker, cornerman, tachymeter, typist, chamberlain, tabulator, wristwatch, officiating, crier, tipstaff, whistle, steward, sentinel, groundskeeper, fosbury flop, bartender, tuning fork, reverso, tissot, town crier, guesser, spotter, bell, motorman, tachometers, sexton, timecard, blockhead, weighmaster, prompter, boatswain, ringmaster, checker, dsq, brakemen, scoreboard, barker, trackman, gatekeeper, totalizer, aerodynamicist, verifier, scorebook, emcee, countdown, transcriber, replays, commissionaire, wind vane, defib, lector, jouster, woodwind instrument, cowbell, officiator, capstan, surfman, synchronism, rulebook, clapper, whistler, roman numeral, accutron, caretaker, paymaster, accountant, barometer, custodian, guardian, observatory, prop, accompanist, bookkeeper, guide, reporter, solicitor, staple, yardstick, auctioneer

atomic clock, hourglass, sandglass, ticker, timer, watch

measuring instrument, measuring system, official