Keithley 6514 e digital multimeter electrometer keithley 6514 e p the keithley 6514 e digital multimeter electrometer combines flexible interfacing capabilities with current sensitivity charge measurement capabilities resolution and speed that are equal or superior to other electrometers p p the 6514 e has built in ieee 488 rs 232 and digital i o interfaces making it simple to configure fully automated high speed systems for low level testing p p the 5 frac12 digit 6514 e is