Fluke 1lac a Ii

As an Amazon Associate, we earn from qualifying purchases. The fluke 1lac a ii, which Fluke sells as the 1LAC II A, is a non-contact voltage tester. It detects AC voltage through insulation without touching a bare conductor, and it signals with a red LED at the tip and an audible beeper that can be switched off. Its stated range is 20 V to 90 V AC for control circuits, and it carries a CAT IV 1000 V rating. This article explains what the tool does, what its specifications mean in practice, where it fits next to a multimeter, and what it cannot tell you. Specifications come from Fluke’s product pages, which we opened on 2026-10-29.

Quick answer

The Fluke 1LAC A II is a non-contact voltage tester. It detects AC voltage in the 20 V to 90 V control-circuit range, signals with a red LED and an optional beeper, carries a CAT IV 1000 V rating, and uses two AAA batteries. It does not show a voltage value, so confirm any result with a meter before you work on a circuit.

What a low voltage detector does

A non-contact voltage tester, sometimes called a low voltage detector, is a go or no-go check. You bring the tip near an insulated wire, cable or device, and the tool tells you whether it senses AC voltage. It does not show a number. That makes it fast for a first pass, such as finding which wire in a control panel is live before you open it, or confirming that a cord carries power.

Fluke’s page explains the detection method in plain terms. The tool senses the steady-state electrostatic field that AC voltage creates through insulation. Because it reads the field and not the current, it works through the jacket of an insulated conductor. That is the reason it is useful, and it is also the reason it can give false signals near strong fields or through poor insulation, which is why a meter check is still the proper test.

The specifications that matter

Two figures define the 1LAC II A for most buyers, and both come from the Fluke pages we opened. The first is the voltage range. Fluke’s pages list the detection range as 20 V to 90 V AC for the control circuit model. That range is well below mains voltage, so the tool is aimed at low-voltage control wiring, low-level signals and the switched side of a circuit, not at a 120 V or 240 V receptacle.

The second figure is the safety rating. Fluke states 1000 V and CAT IV. A CAT IV rating is the highest of the common measurement categories, and it is intended for work at the origin of an installation. We report the rating as Fluke states it.

The tool uses two AAA alkaline batteries, which Fluke includes, and gives a typical battery life of more than one year. The pages also state a two-year warranty. We did not confirm the environmental ratings from the pages we opened, so we have left them out.

Indicators and the silent option

The 1LAC II A uses one high-intensity red LED at the tip, which glows when voltage is detected. An audible beeper sounds at the same time, and the page says it can be switched off for silent operation. Silent mode is useful in a quiet space, but it removes the second warning. If you work in a noisy area, keep the beeper on so you do not miss a detection that the LED alone might not catch in bright light.

Where it fits next to a multimeter

A non-contact tester and a multimeter do different jobs. The tester tells you whether AC voltage is present near an insulated conductor, quickly and without contact. The multimeter gives you a number, lets you test DC, resistance and continuity, and measures under load. Use the tester to find the live conductor, then confirm the value with a meter that is rated for the circuit. For guidance on meter selection, our guide to the best continuity tester covers the continuity side of that workflow.

Do not treat a non-contact result as proof that a circuit is dead. A quiet tester does not prove the absence of voltage. Always verify the result on a known live source before and after the test, and test the conductor directly with a meter before you touch it.

What we could not verify

The pages we opened give a 20 V to 90 V detection range for the control circuit model. We did not find a published detection range for a different model variant, so we have not described one. We could not confirm street pricing from the pages we opened, and we have not stated a price. We also did not run an independent test of detection range or sensitivity, so the figures here are Fluke’s stated values. The category page we opened describes non-contact detectors in general and does not add model-level figures.

Who should consider it

The 1LAC II A suits an electrician or maintenance worker who needs a quick, pocket-size check on control wiring and low-voltage circuits. It is not a substitute for a meter on a 120 V or 240 V circuit, and it is not a replacement for a proper test of absence of voltage on high-energy equipment. Pair it with a meter, and follow the test procedure your employer or local rules require. A quick check on a known live source before and after each use takes only seconds, and it catches a weak battery or a dead LED before you rely on a result. Store the tool in a dry place, and replace the AAA batteries when the LED dims, because a dim indicator is an easy signal to miss in bright light.

If you are looking for a broader set of test tools, our guide to the best 3 prong outlet tester covers the receptacle checks many homeowners need, and our continuity tester how-to covers the next step after detection.

How we chose

We limited this explainer to Fluke’s own product pages, because they carry the figures a buyer needs. We opened the Canadian and Irish product pages for the 1LAC II A, and a Fluke electrical test tools overview page for context. The overview page gives no model-level figures, so we used it only to confirm how Fluke describes non-contact detectors. We did not use third-party reviews, because we could not check their test methods, and we did not run our own detection tests. Where the regional pages agreed, we report the figure once.

FAQ

Does the Fluke 1LAC A II measure a voltage value?

No. It is a detector that signals the presence of AC voltage in its stated range. It does not display a number.

What voltage range does it detect?

Fluke lists 20 V to 90 V AC for the control circuit model.

What safety rating does it carry?

Fluke states 1000 V, CAT IV, with compliance to the listed IEC, UL and CSA standards.

What batteries does it use?

Two AAA alkaline batteries, included, with a typical life of more than one year.

Can it be silenced?

Yes. The beeper can be switched off, and the red LED still lights.

Sources

• Fluke, Fluke 1LAC II A product page (en-ca), opened 2026-10-29: https://www.fluke.com/en-ca/product/electrical-testing/basic-testers/fluke-1lac-ii-a
• Fluke, Fluke 1LAC II A product page (en-ie), opened 2026-10-29: https://www.fluke.com/en-ie/product/electrical-testing/basic-testers/fluke-1lac-ii-a
• Fluke, electrical test tools category page (en-us), opened 2026-10-29: https://www.fluke.com/en-us/product/electrical-testing/multimeters/fluke-1lac-a-ii