Klein Tools ET300 Circuit Breaker Finder / Receptacle Tester $26 at Amazon

Ideal for home offices and home theaters where electronic devices are used, 6 Grounded outlets : accepts 3 bulky AC adapters & 3 standard plugs, Circuit Breaker: 15A circuit breaker shuts off power to the outlers in case of an overload or short circuit, Reset Switch: handy switch located on top of the unit, UL Listed

The MM300 multimeter measures AC/DC voltage, DC current and resistance and has a safety rating of CAT III 600V, Class 2, Double insulation, The NCVT-1 has a bright green LED to indicate the tester is working; it changes to red and warning tones sound when voltage is detected, NCVT-1 has a digitally-controlled ON/OFF power button and auto power-off feature to conserve and extend battery life, Receptacle tester detects wiring configurations and indicates correct wiring, and identifies common wiring faults, Identifies open ground, open hot, open neutral, hot/ground reversed; it does not indicate quality of ground, multiple hot wires, or a combination of defects