Keithley 2700-Digital multimeter and Keithley 2700 data acquisition system 6 ½ digits (22 bits), 2 slots for switching modules, up to 80 differential channels (with 300 V isolation) for measurement and control, GPIB and RS-232 interfaces. Combines the functions of a digital multimeter, a switching system and a data logger 6½-bit resolution (22-bits) 12 built-in switching/control modules Up to 80 differential inputs for measurement and monitoring (with 300 V isolation) Convenient location