photoconductive cell
photoelectric cell
photocell
electric eye
magic eye
roentgenometer
reflector
green
absorptiometer
penetrometer
foreprism
parabolic mirror
thermophone
goniophotometer
infrared
radio source
mosaic
monogon
beamtrain
ray
photonephelometer
photodetector
fluorosensor
leuconephelinite
bolometer
source of illumination
fluorodetector
tranny
Geiger-Muller counter
radioprobe
strainometer
Geiger counter
transilluminator
fluoro
chromatoscanner
ondoscope
electromagnetic transducer
orthomode
photorespirometer
fluorescent
electromechanical transducer
beampattern
electric light
proctoscope
pyranometer
bhangmeter
fluorescent lamp
fluorometer
photoscanner
diffusing screen