Plug it in and read the diagram on the device, it will help you decipher the position of the light and the patterns you see. It worked on all my 110 volt outlets.
β Stainless Steel L-Square, Size 3-Inch x 4-Inch, Zona 37-434
8 Review
π² Johnson RAS-1B Johnny Square: Professional Aluminum Rafter Square, 7'', Silver - Top Quality with 1 Square
8 Review
Kapro 307-08-TMS Try And Mitre Layout And Marking Square With Stainless Steel Blade, 8-Inch Length
18 Review
Triangle Group TR918 225/45 R18 95V summer
61 Review