Klein Tools ET45 Digital AC/DC Voltage Tester 12-240V AC 32-330V DC

Compact Digital Voltage Tester

The Klein Tools ET45 is a battery-free digital voltage tester designed for electricians and technicians who need to verify AC and DC voltage presence in residential and commercial wiring. It draws operating power directly from the circuit under test, so it is always ready without battery maintenance. The tester covers 12-240V AC and 32-330V DC across four indication levels, with LED illumination and DC polarity detection for clear readings. A built-in pocket clip allows convenient carrying on the job.

Fits Standard Outlets And Tool Bags

Built-in test lead holders on the back space the probes for tamper-resistant US-style outlets, letting you insert the tester directly without loose leads. The compact 4.45 x 1.19 x 1.05 inch body weighs only 1.8 ounces, freeing pocket space and reducing fatigue during extended troubleshooting sessions. An auto-off function conserves the voltage-powered operation when the tester is not actively measuring. IP44 ingress protection and 9.8-foot drop resistance let it survive dust, splashes and jobsite impacts.

Four-Level Indication Up To 240V AC And 330V DC

Bright LEDs show four discrete voltage levels for both AC and DC ranges, giving immediate visual confirmation of approximate magnitude and polarity. The CAT III 350V safety rating with Class 2 double insulation provides protection for measurements on fixed installation wiring. The tester does not supply precise numeric readouts, so it is not suited for calibration tasks or low-voltage electronics work requiring millivolt resolution. Buyers needing continuous data logging or true-RMS accuracy should select a full-featured multimeter instead.