The Fluke 1AC-II VoltAlert Voltage Tester glows red and beeps when it detects AC voltage between 90 and 1000V. Users need only touch the Fluke 1AC-II VoltAlert Voltage Tester’s tip to the terminal strip, outlet, or cord. This rugged, reliable voltage indicator is CAT IV 1000V overvoltage rated and can be used to test for energised circuits and defective grounds, as well as identify incorrectly wired outlets. It is ideal for electricians, maintenance, service and safety personnel, and homeowners.