Klein USA Digital AC/DC Voltage Tester ( ET40 )

HIGHLIGHTS:

The Klein Tools Digital AC/DC Voltage Tester (ET40) is a compact and reliable electronic voltage tester designed for quickly identifying and distinguishing between AC and DC voltage sources. Engineered for electricians, maintenance technicians, HVAC professionals, and general troubleshooting applications, the ET40 provides clear LED indication of both voltage type and level for fast diagnostics in residential and light commercial electrical systems.

The tester measures AC voltages from 12V to 240V at four commonly used residential voltage levels and DC voltages from 1.5V to greater than 17–24V at four useful DC ranges. Bright LED indicators clearly display the detected voltage level, while dedicated polarity indicators identify DC positive and DC negative connections.

Built with a rugged housing, the ET40 is designed to withstand a 9.8 ft (3 m) drop and features IP41 dust and water resistance for dependable jobsite durability. The tester automatically powers off after approximately two minutes of inactivity to help conserve battery life, and the integrated lead holders keep the test leads neatly organized during storage and transport.

With a convenient pocket clip, low battery indicator, and included AAA batteries, the Klein ET40 is ready for everyday electrical troubleshooting right out of the package.

FEATURES:

• Measures AC Voltage from 12V to 240V at four useful levels
• Measures DC Voltage from 1.5V to >17–24V at four useful levels
• Bright LED Indicators show voltage type and level
• DC Polarity Indicators identify positive and negative connections
• Automatically Distinguishes AC and DC Voltage
• 9.8 ft (3 m) Drop Protection for jobsite durability
• IP41 Dust and Water Resistant
• Auto Power-Off after approximately 2 minutes of non-use
• Built-In Test Lead Holders for convenient storage
• Low Battery Indicator with easy-access battery compartment
• Pocket Clip for secure everyday carrying
• CAT III 250V, Class 2 Double Insulated

APPLICATIONS:

• Residential electrical troubleshooting
• Verifying AC branch circuit voltage
• Testing low-voltage DC systems
• Battery and control circuit checks
• HVAC electrical diagnostics
• General maintenance and repair work

The Klein Tools ET40 Digital AC/DC Voltage Tester provides fast, reliable voltage indication with clear polarity detection and rugged durability, making it an excellent choice for electricians and maintenance professionals who need a compact everyday voltage tester.