Klein Tools ET45 AC/DC Voltage...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$67.91
$14.24
Klein Tools ET45 AC/DC Voltage Tester

Klein Tools ET45 AC/DC Voltage Tester

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Model: ET45
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$67.91
$14.24
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AC/DC Voltage Tester

  • Warnings

    • Before each use, verify tester operation by measuring a known voltage.
    • Never use the tester on a circuit with voltages that exceed the category based rating of this tester.
    • Usage of this tester in any way other than that specified by the manufacturer can impair safe operation, resulting in severe injury or death.
    • Read, understand, and follow all instructions, cautions and warnings attached to and/or packed with all test and measurement devices before each use.
    • Always adhere to local and national safety codes. Use personal protective equipment to prevent shock and arc blast injury where hazardous live conductors are exposed.

  • Features

    • Safety Rating - CATIII 350V, Class 2, Double insulation
    • Built to withstand a 9.8-Foot (3 m) drop
    • Built-in Test Lead Holders on Back of Tester Spaced Correctly to Hold Leads for Testing Tamper-Resistant US-style Outlets
    • Pocket clip secures tester to pocket for reliable everyday carrying
    • Test leads can be docked in the holder for convenient storage
    • Batteries not required; tester is powered by the applied voltage
    • Ingress protection IP44 dust and water resistant
    • Built-in test lead holder on back of tester holds the leads in one of two positions - one so that they are spaced correctly to test tamper-resistant US-style outlets and the other for convenient storage of the test leads
    • Tests AC voltages from 24V to 240V AC at four useful levels
    • Tests DC voltages from 32V to 330V at four levels


ET45 - spec sheet

Manufacturer Resources

Spec Sheet

Product Specs

Accessories:
5139C, 5139PAD
Display:
Analog LED
Drop Protection:
9.8' (3 m)
Frequency:
50/60 Hz
Ingress Protection:
IP44
Integral Lead Storage:
Yes
Interchangeable Leads:
No
Item Depth:
4.4500 in
Item Height:
1.0500 in
Item Weight:
0.1100 lbs
Item Width:
1.1900 in
Lead Length:
9" (23 cm)
Overall Height:
1.19" (3 cm)
Overall Length:
4.45" (11.3 cm)
Overall Width:
1.05" (2.7 cm)
Pollution Degree:
2
Standards:
CATIII 350V, CE
Tests Continuity:
No
Department:
Electrical
Product Group:
Test & Measurement
Product Subgroup:
Voltage Testers
Product Type:
Contact Voltage Tester
Product Details:
Electronic Products
Product Material:
Plastic Housing, PCB with Electronic Components
Product Weight:
1.8 oz (52.0 g)
Product Depth:
4.45 in
Product Height:
1.05 in
Product Width:
1.19 in

Klein Tools ET45 – Frequently Asked Questions

1) What voltage range does the Klein Tools ET45 tester cover?
The ET45 reads AC from 24V to 240V at four indicated levels, and DC from 32V to 330V at four levels, at 50/60 Hz. That covers residential and light commercial line voltage work, 120V and 240V circuits, plus DC control and battery circuits up to 330V. Anything below 24V AC or 32V DC is outside its range, so it is not the tool for low-voltage thermostat or doorbell wiring.
2) Is the ET45 rated CAT III for panel work?
It carries a CAT III 350V rating and is CE marked, Class 2 double insulated, pollution degree 2. CAT III covers distribution level circuits such as panelboards, feeders and hardwired equipment. Never apply it to a circuit above that 350V category rating.
3) Does the Klein ET45 need batteries?
No batteries. The ET45 is powered by the voltage it is measuring, so there is nothing to go dead in a truck or a tool crib drawer. Because of that, verify it against a known live voltage before each use, since there is no self-test on a dead circuit.
4) Will this tester work on tamper-resistant outlets?
Yes. The back of the ET45 has a built-in lead holder with two positions: one spaces the probes correctly to engage tamper-resistant US-style receptacles, the other simply stows the leads. The TR shutters need both blades pushed simultaneously, which is why the fixed spacing matters.
5) Can the test leads be replaced on the ET45?
No. The leads are not interchangeable, they are captive to the tester, and they measure 9 inches (23 cm). If a lead is damaged the unit is replaced, not re-tipped, so factor that into a fleet standardization decision.
6) Does the ET45 do a continuity check too?
It does not test continuity. The ET45 is a voltage presence and level indicator only, with an analog LED scale rather than a digital readout. For ringing out conductors or checking a switch leg dead, you need a multimeter or a dedicated continuity tester alongside it.
7) Is the Klein ET45 tough enough for daily jobsite and MRO use?
Built to survive a 9.8 foot (3 m) drop and rated IP44 for dust and water resistance, so light rain, splash and general site dirt are within its envelope. The housing is plastic over a PCB, it weighs 1.8 oz (52 g), and a pocket clip holds it for everyday carry. IP44 is splash resistant, not submersible.
8) How big is the ET45 and will it ride in a shirt pocket?
Overall it runs 4.45 inches long, 1.19 inches high and 1.05 inches wide, at 1.8 oz. That is pocket size, and the integrated clip is there for it. The 9 inch captive leads dock on the back so nothing dangles loose in the pouch.
9) What accessories go with the Klein ET45 voltage tester?
Klein lists the 5139C and 5139PAD as the accessories for the ET45. Nothing extra is needed to use the tester itself, since the leads are permanently attached and no batteries are required.
10) What is the exact part number to order this Klein voltage tester?
Order it as Klein Tools ET45. That is the model and the manufacturer part number, and the tester is offered in that single configuration with no finish or range options to specify.
How fast can I get the Klein Tools ET45 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Klein Tools ET45 come with a warranty?
Absolutely. The Klein Tools ET45 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Klein Tools ET45?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Klein Tools ET45 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
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