Fluke-1AC-E-II-Volt-Alert-Fluke-2432971-p-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-ma