Be sure to read the testing instructions carefully. This is the cheapest place I could buy them and all 9 worked perfectly. As mentioned above, when testing a closed circuit, hold down the test button AND hold it down while testing the open circuit breakers. This time you need to read the instructions.
π‘ Professional Generator Interlock Kit: Compatible with Square D QO or Homeline 150/200 Amp Panels, 1 3/8" Spacing Between Main and Generator Breaker
7 Review
π GE 150 or 200 Amp Main Breaker Generator Interlock Kit - 1 1/4 Inch Spacing Between Main and Branch Breaker
7 Review
π Poniie PN1500 Portable Electricity Usage Monitor - Power Consumption Watt Meter Voltage Amp Tester (110V, 1500W)
9 Review
β‘ Enhanced Watt Meter Power Meter Plug: Convenient Home Electricity Usage Monitoring with Backlight, Overload Protection, & 7 Modes Display
7 Review
β‘οΈ Sunpark LC-12014T (1) FC12T9 32W Circline (1) 2D 38W (1) FC16T9 40W Circline (1) FC9T9 30W Circline Lamp Compact Electronic Fluorescent Ballast with Circline Lamp Plug 120V
7 Review
π‘ Electronic FL Ballast ICN-4P32-N (Formerly ICN-4P32-SC) for 3-4 F32T8 F40T8 F17T8 Lamps, 120V/277V Compatibility
5 Review
π‘ High-Quality Advance ICN-4P32-SC Electronic Fluorescent Ballast: Ideal for 4 Lamps, 32W T8, 120/277V
3 Review
Robertson Worldwide ISL432T8HEMV AH 3P20160 120-277V 50-60Hz High Power Factor 4 F32T8 Linear Lamp Fluorescent eBallast
6 Review