For portable instrumentation a custom design is usually the best option. If your want to keep your instrument in the case at all times but still need to use it then an instrument case like the one listed above is the right option for you. We have built these cases in the past with clear vinyl windows that allow you to see the buttons and use them while the product is still in the case.
A custom case can be designed to allow for ventilation as well as access to auxiliary ports. A detachable shoulder strap can be added for ease of transportation. Cases are made with your choice or materials and to the exact specifications of your equipment. There is no better way to protect expensive and sensitive instrumentation than with a custom carrying case.