lucimeter
illuminometer
heliograph
nightscope
photometer
Fizeau-Foucault apparatus
panel light
ometer
photometrician
absorptiometer
chromascope
light microscope
magnascope
photometrograph
scotoscope
microscope
magnifying glass
astrometer
metra
chromometer
retinoscope
sensitometer
dynameter
fluorometer
auxometer
exposure meter
light meter
optophone
scientific instrument
metrochrome
goniophotometer
spectroscope
streak camera
focimeter
pseudoscope
saccadometer
spectropolarimeter
booklight
horometer
leukometer
guidelight
chronoscope
velometer
optical instrument
transmissometer
orthoscope
haemadromograph
electric light
piezometer
carcel