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nounan instrument for measuring the intensity of electromagnetic radiation (usually by the photochemical effect)
Words sounding like good actinometer
barometer electrometer radiometer chronometer spectrometer speedometer manometer densitometer odometer pedometer micrometer fathometer dynamometer magnetometer tachometer sphygmomanometer anemometer tacheometer disk photometer prism spectrometer milometer psychrometer half chronometer actinometer pocket chronometer mass spectrometer electronic chronometer sclerometer marine barometer precision barometer