Fluke 1ac e ii volt alert fluke fluke 1ac the fluke 1ac e ii volt alert is extremely easy to use simply touch the tip to a terminal strip outlet or cord when the tip glows red and the unit beeps and you know there is voltage in the line this voltage tester works by sensing the steady state electrostatic field produced by an ac voltage so will even work through insulation which means it does not require contact to the bare conductor br br it is ideal for homeowners electricians mai