The HRAT provides a continuous high-resolution oriented ultrasound image of the borehole wall. A unique optical system based on a fisheye lens allows the probe to survey 360 degrees simultaneously. The probe offers superior resolution to the HRAT acoustic probe and produces images in real colour. While, unlike the HRAT, it can operate in air-filled boreholes, it is unsuitable for boreholes containing mud or cloudy fluids. Natural Gamma measurement apparatus are added for correlation other data on the probe. Borehole imaging applications are executed with this probe is manufactured by Robertson GEOLOGGING.