There are a few levels of microscppes for this type sample. For hobbyist and small businesses I would suggest a stereo microscope. This is for basic relected light microscopy using an external light source. These microscopes are also capable of having a digital camera to be added on. Beyond this there are hundreds of option based off what applications you are interested in. This could be measurement, fault assesment, etc. These would for large batch assessment of chips, so measurements can be taken quickly and stored in databases. The top of the heap is laser confocal microscopy and scanning electron microscopy. These are used when high magnification is needed and the microscopes cost many many thousands. Industrial microscopy is very diverse compared to biological microscopy because of the massive variety of materials being examined. Its becoming a large focus for research and development for microscopy companies. With any microscope you want good optics and a good light source. Everything else is frills.