Klein Tools ET40 Digital AC/DC Voltage Tester – 12-240V AC / 1.5-24V DC | IP41, CAT III 250V

A versatile tester built for professional use

The Klein Tools ET40 Electronic AC/DC Voltage Tester helps you verify live circuits quickly and safely. It measures AC voltages from 12V to 240V and DC voltages from 1.5V to 24V, covering common residential and device-level realities. The bright LEDs illuminate to clearly indicate voltage type and level, so you can read values at a glance even in cluttered panels or shaded work areas.

Designed for real world job sites

Built for rugged environments, the ET40 includes built-in test lead holders on the back for neat storage and ready access. It also offers polarity indication to help with DC troubleshooting, streamlining the process when checking battery packs or DC circuits.

Durable and safe test gear

With its IP41 dust and water resistance and CAT III 250V, this tester meets demanding safety expectations. The design includes double insulation for enhanced protection and a durable build that stands up to daily professional use.

Key specifications at a glance

• AC voltage range: 12 to 240V
• DC voltage range: 1.5 to 24V
• Polarity indication for DC circuits
• Bright LED indicators for clear readings
• Built in test lead holders for storage
• IP41 protection for dust and water resistance
• CAT III 250V safety class and double insulation

Practical uses in daily work

• Quick checks of outlets, lighting fixtures, and appliances
• DC circuit verification for battery packs and controllers
• Troubleshooting wiring issues in residential and commercial settings
• Reliable readings with durable design during busy shifts

With a long standing heritage since 1857, Klein Tools combines six generations of engineering know how with high quality materials and workmanship. This ET40 is designed to support professionals who rely on accuracy, clarity, and durability in the field, without over promising results. Consider it a dependable companion for voltage verification tasks across a range of electrical environments.