The Keithley 7710 20-Channel Solid-State Differential Multiplexer Module offers 20 channels of 2-pole or 10 channels of 4-pole relay input that can be configured as two independent banks of multiplexers. The relays are solid state, providing long life and low maintenance. Solidstate relays usually have 100 times longer life than mechanical relays. The 7710 is ideal for long-term data logging applications as well as for demanding high-speed applications.