Switches act as the interface between the equipment under test and the test instrument’s routing signals during an electronic test. Depending on their measurement needs, engineers use solid-state switches, mercury-wetted relays, armature relays, or reed relays. Armature relays are the most common switches, thanks to their affordable costs and ability to handle high voltages and currents. Reed relays are good when engineers need to switch at fast speeds. Browse used and refurbished switches at ValueTronics.com.