These keypads are preferred over membranes or conductive rubber in applications where reliability is critical to the application. This type of contact technology is resistant to problems that commonly plague membrane switches, like silver-ink migration and trace fractures. This can be critical when equipment downtime or service costs are very expensive. The operator may be wearing gloves and a positive tactile feedback is desired. Minimal contact resistance is required. The dome on PCB contact technology has the lowest contact resistance of all keypad switch technologies.