Counting instruments

instrument used for measuring ionizing radiation

type of clock used to wake up a sleeping person at a certain time

gaseous ionization detector

measuring device that determines the basic frequency of the alternating component of an electrical voltage

system used in railway signalling

device for counting bicycle traffic

apparatus for counting and sizing particles suspended in electrolytes

public counter of government debt

mechanical device used to maintain a linear count

device that counts people as they pass

count of the number of people and/or vehicles passing through a space

device fitted to a bicycle to count revolutions of the wheels