Start with the environment. Decide how much dust, water and chemical exposure the keyboard will face, then match the ingress rating. IP65 covers low-pressure water jets and IP66 powerful water jets; neither covers immersion or high-pressure, high-temperature washdown, and the rating applies only once the keyboard is installed correctly. Next consider the material: sealed silicone over a membrane is light and cost-effective, whereas stainless steel resists corrosion and heavy cleaning. If the keyboard will be handled or vehicle-mounted, look for manufacturer-stated shock and vibration testing such as MIL-STD-810, and confirm the operating temperature range covers freezer rooms or hot plant. Decide on the form factor, desktop, panel mount or OEM, and whether an integrated pointer would save space. Then match the interface, USB, PS/2 or wireless, to your equipment, and confirm the layout suits the task. For hazardous (zoned) areas, ask for the ATEX or IECEx certification for your zone. When you ask for a quote, give us the environment, mounting, pointer, interface, layout and cleaning regime.