photometer

Euclid also has a near-infrared spectrometer and photometer for measuring each galaxy’s redshift, or the wavelength-stretching effect that occurs in light arriving from the faraway cosmos.

The University of Bern has provided a powerful photometer for the telescope.

He just needed a photometer 1000 times more sensitive than any available.

Earth appears so bright because Kepler's light-sensing photometer is exquisitely sensitive.

For each sample, I use a refractometer, which measures moisture content, a pH meter for acidity, a honey color photometer, and other instruments that measure acidity and viscosity.