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.
P3 P4400 Electricity Usage Monitor
9 Review
π Interlock Kit for Generators with Cover and QOM2 Frame Size Main Breaker Interlock Kit
8 Review
π Fulton 110V Single Phase On/Off Switch with Large Stop Sign Paddle: Ideal for Router Tables, Table Saws, and Small Machinery
6 Review
π GE 150 or 200 Amp Main Breaker Generator Interlock Kit - 1 1/4 Inch Spacing Between Main and Branch Breaker
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 Robertson 2P20132 Quik-Pak: 10 Fluorescent eBallasts for 2 F40T12 Linear Lamps, Preheat Rapid Start, 120Vac, 50-60Hz, Normal Ballast Factor, NPF, Model RSW234T12120 /A (Crosses to RSW240T12120 /B)
4 Review
Robertson Worldwide ISL432T8HEMV AH 3P20160 120-277V 50-60Hz High Power Factor 4 F32T8 Linear Lamp Fluorescent eBallast
6 Review
π‘ Hydrofarm Quantum QT400 Dimmable Ballast for 400W Grow Lights
5 Review