#meter.measuring_instrument  any of various measuring instruments for measuring a quantity
  supertype:  #measuring_instrument__measuringinstrument__measuring_system__measuringsystem__measuring_device__measuringdevice  instrument that shows the extent or amount or quantity or degree of something
  subtype:  #ammeter  a meter that measures the flow of electrical current in amperes
     subtype:  #milliammeter  a sensitive ammeter graduated in milliamperes
  subtype:  #electrometer  meter to measure electrostatic voltage differences; draws no current from the source
  subtype:  #fluxmeter  meter that measures magnetic flux by the current it generates in a coil
  subtype:  #galvanometer  meter for detecting or comparing or measuring small electric currents
     subtype:  #astatic_galvanometer__astaticgalvanometer  has a moving magnet and astatic coils arranged to cancel the effect of the Earth's magnetic field
     subtype:  #moving-coil_galvanometer  a galvanometer that is operated by the force exerted by an electric current flowing in a movable coil suspended in a magnetic field
        subtype:  #ballistic_galvanometer__ballisticgalvanometer  a moving-coil galvanometer that measures electric charge
  subtype:  #gas_meter__gasmeter__gasometer  a meter for measuring the amount of gas flowing through a particular pipe
  subtype:  #magnetometer__gaussmeter  an meter to compare strengths of magnetic fields
  subtype:  #odometer__hodometer__mileometer__milometer  a meter that shows mileage traversed
  subtype:  #ohmmeter  a meter for measuring electrical resistance in ohms
  subtype:  #postage_meter__postagemeter  meter for bulk mailings that imprints correct prepaid postage on pieces of mail and records the total charge
  subtype:  #radiometer  meter to detect and measure radiant energy (electromagnetic or acoustic)
     subtype:  #Crookes_radiometer  electromagnetic radiometer consisting of a small paddlewheel that rotates when placed in daylight
     subtype:  #radiomicrometer  radiometer that is extremely sensitive
     subtype:  #Rayleigh_disk  an acoustic radiometer consisting of a light disk suspended from a quartz thread; when exposed to a progressive sound wave its torque can measure velocity
  subtype:  #reflectometer  a meter that measures the reflectance of a surface
  subtype:  #speedometer__speed_indicator__speedindicator  a meter fixed to a vehicle that measures and displays its speed
     subtype:  #machmeter  speedometer for measuring the speed of an aircraft relative to the speed of sound
  subtype:  #taximeter  a meter in a taxi that registers the fare (based on the length of the ride)
  subtype:  #voltmeter  meter that measures the potential difference between two points
     subtype:  #electronic_voltmeter  a voltmeter whose sensitivity is increased by amplification
        subtype:  #digital_voltmeter__digitalvoltmeter  an electronic voltmeter that gives readings in digits
     subtype:  #millivoltmeter  sensitive voltmeter that can measure voltage in millivolts
  subtype:  #water_meter__watermeter  meter for measuring the quantity of water passing through a particular outlet

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