An essential tool for testing light switches is a continuity tester. You also can use a multimeter by turning the dial to read “continuity.” ...

The latest addition to Keithley Instrument's plug-in switch and control cards for its Series 3700 System Switch/Multimeter mainframe is a two-pole reed-relay matrix card with 6 rows by 16 columns.

Cleveland, Ohio — Keithley Instruments, Inc. has expanded the Series 3700 system switch/multimeter and plug-in card family with the addition of two plug-in cards — the Model 3724 dual 1X30 solid-state ...