Fluke 1LAC II VoltAlert detects the presence of 20–90 V AC in control circuits without contacting a bare conductor. A red LED in the round tip and an enabled beeper indicate detected voltage. Voltbeat self-test, an on/off button and a silent mode support everyday use. Two AAA batteries power the detector. It indicates AC presence without displaying a numerical voltage measurement. The CAT IV 1000 V safety rating does not extend this model’s detection range: its sensing range remains 20–90 V AC.