Half-maximum threshold circuit for optical micrometer
Hand-held automatic refractometer
Handy refractometer
Heat exchanger for refractometer
Hemispherical double reflection optical sensor
High resolution alignment interferometer
High resolution, high contrast Fabry-Perot spectrometer
High temperature differential refractometry apparatus
High-resolution fourier interferometer-spectrophotopolarimeter
High-sensitivity differential refractometer
Highly sensitive process for measuring fine deformation
Holographic arrangement for testing materials without destroying
Holographic shearing interferometer