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Compact yellow voltage tester with LED display and probe tips

Klein Tools ET40 Digital AC/DC Voltage Tester 12-240V AC 1.5-24V DC

SKU CH-P6FY-R7AVD

Tests AC voltage from 12 to 240V and DC voltage from 1.5 to 24V with LED indication, DC polarity detection, IP41 rating and CAT III 250V safety

  • FeaturesNo/Tester, User Manual, and 2 x AAA Batteries, CE, Battery P
  • Height5.24 L x 1.52 W x 1.11 H inches
  • Width5.24 L x 1.52 W x 1.11 H inches
  • Length5.24 L x 1.52 W x 1.11 H inches
  • Weight2.3 ounces
  • Sports Team1 Piece
  • Tests AC 12-240 V and DC 1.5-24 V for versatile electrical work
  • Bright LEDs show voltage type and level at a glance
  • DC polarity indication speeds up troubleshooting
  • CAT III 250 V, Class 2 double insulation meets high safety standards
  • IP41 rated and survives 9.8 ft drops for jobsite durability

Versatile AC/DC voltage tester

The Klein Tools ET40 measures AC voltages from 12V to 240V and DC voltages from 1.5V to 24V across four indication levels. It suits electricians and technicians verifying residential wiring or low-voltage DC circuits. Bright LEDs show voltage type and magnitude at a glance. The tester includes built-in lead holders spaced for tamper-resistant outlets.

Safety rating and job-site durability

The unit carries a CAT III 250V, Class 2, double-insulation rating for protected operation on fixed installations. IP41 ingress protection resists dust and dripping water in harsh environments. A 9.8-foot drop rating ensures survival after falls from ladders or workbenches. Auto power-off preserves the two included AAA batteries during daily use.

Polarity indication for DC troubleshooting

Positive and negative DC polarity is displayed directly on the LED scale, letting users confirm battery orientation or sensor wiring without a separate multimeter. The feature covers the 1.5V to 24V DC range in four steps. Buyers needing precise numeric readings or continuity testing should select a full-featured multimeter instead.

Highlights

  • Tests AC 12-240 V and DC 1.5-24 V for versatile electrical work
  • Bright LEDs show voltage type and level at a glance
  • DC polarity indication speeds up troubleshooting
  • CAT III 250 V, Class 2 double insulation meets high safety standards
  • IP41 rated and survives 9.8 ft drops for jobsite durability

Specifications

BrandKLEIN TOOLS, Klein Tools
FeaturesNo/Tester, User Manual, and 2 x AAA Batteries, CE, Battery Powered, true
Height5.24 L x 1.52 W x 1.11 H inches
Width5.24 L x 1.52 W x 1.11 H inches
Length5.24 L x 1.52 W x 1.11 H inches
Weight2.3 ounces
Sports Team1 Piece
TypeVoltmeter

Questions about this item

How do I install the batteries in the ET40 tester and which polarity is correct?

Open the battery compartment on the rear, insert two AAA cells matching the plus and minus symbols moulded inside, then close the cover until it clicks.

What maintenance or replacement will the ET40 need over time?

Replace the two AAA batteries when the LED indicators dim or fail to light during a known live circuit test.

At what voltage does the ET40 stop indicating DC levels under sustained use?

The DC indication covers 1.5 V to over 17 V up to 24 V; above 24 V DC the tester does not show a level.

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