Optical sensors; Optical inspection apparatus; Apparatus for testing the optical properties of augmented reality, virtual reality, and mixed reality devices; Calibration devices for calibrating optical emission apparatus; Calibration devices for calibrating optical sensors; Spectrometers for industrial use; Goniometers for industrial use; Light sources capable of emitting different frequencies and different intensities of light; Spectral light meters; Retroreflectometers; Transimpedance amplifiers; Laser intensity meters; Laser wavelength meters; Laser power meters
Electrical and Scientific Apparatus