StellarNet BLACK-Comet concave grating spectrometers deliver high performance for spectroscopy applications in the UV-VIS wavelength ranges covering 190-850nm (model C), or optionally 280-900nm (model CXR)

Research Grade Optical Performance – The BLACK-Comet UV-VIS spectrometers utilize a 40mm diameter concave grating with aberration correction to provide the best optical performance of any compact spectrometer on the market.

Improved spectral shapes by reducing comma and astigmatism found in plane grating spectrograph designs.
Stray light reduction - The spectrograph architecture does not utilize mirrors, and therefore provides the lowest possible stray light, which is especially helpful for UV applications.
Enhanced sensitivity - due to the spectrometers ability to reduce light scatter, especially high power UV light, the BLACK-Comet provides two to three times enhanced UV sensitivity as compared to plane grating/Czerny Turner optical configurations.
Uniform resolution – The concave grating produces a flat field on the CCD detector creating uniform resolution over the entire spectral range.
Thermal Stability - Optical bench architecture without mounting turrets and optical posts (typically in most USB spectrometers) decreases thermal expansion and contraction and increases overall system performance with temperature change

Various models provide a choice of wavelength range and slit resolutions. New and improved electronics with a high speed 16-bit digitizer allows for fast data acquisition and a signal to noise of 1000:1!