Gradient Lens Corporation (GLC) has upgraded its Slim and Hardy models of Hawkeye Precision Borescopes. Improvements include lower light dispersion, a wider field of view and an improved mirror adapter for seeing around corners. Because these borescopes have small diameters, can see straight ahead (0-degree direction of view) and at 90-degrees with a mirror adaptor, they are used to inspect inside small or deep bores and complex metal machined parts. The improved borescopes feature an endoGrins lens system that lowers the dispersion of light, producing a clearer, sharper image; a scratch-resistant mirror technology in the 90-degree mirror adapter; multi-layered, broadband anti-reflection coatings on the objective lenses delivering truer color reproduction.