Klein Tools ET40 Ac Dc Voltage Tester Cat Iii 250V

Product Description

The KLEIN TOOLS ET40 is an electronic AC/DC voltage tester designed for fast, non-meter voltage detection in residential and light commercial electrical work. It tests AC voltages from 12 volts to 240 volts across four levels aligned with common residential voltages, and DC voltages from 1.5 volts to greater than 17 to 24 volts across four DC-aligned levels. Bright LEDs indicate both the type and level of voltage detected. The ET40 also identifies positive and negative DC polarity, making it useful for low-voltage DC diagnostics as well as standard line-voltage AC checks. Licensed electricians and HVAC technicians are the primary users.

The ET40 is suited for residential service work, panel troubleshooting, fixture and outlet verification, and low-voltage DC circuit checks. The four AC levels align with commonly encountered residential voltages including 12, 24, 120, and 240-volt ranges, while the DC levels cover battery and control-circuit voltages. Its compact form and built-in lead holders on the sides of the tester make it practical for tool belt carry and single-hand operation on the job.

Key Features

• Tests AC voltages from 12 volts to 240 volts at four levels aligned with common residential voltages
• Tests DC voltages from 1.5 volts to greater than 17 to 24 volts at four DC-aligned levels
• Indicates positive and negative DC polarity
• Bright LEDs display voltage type and level at a glance
• CAT III 250V rated with Class 2 double insulation for safe use in residential and light commercial environments
• IP41 rated for dust and water resistance
• Built to withstand a 9.9-foot drop; auto powers off after approximately 2 minutes of non-use to preserve battery life

Compatibility

Designed as a general-purpose AC/DC voltage tester for use in residential electrical systems, low-voltage control circuits, and standard commercial wiring up to CAT III 250V applications.

Installation Notes

Installation and use of this tester should be performed by a licensed electrician or qualified technician following applicable NEC guidelines. Always verify the tester itself is functioning before and after each use by testing on a known live source. Insert the test leads into the built-in side holders when not in use to protect the probes. The ET40 requires two AAA batteries, which are not included; replace batteries promptly when the low-battery indicator activates to ensure accurate readings.

Technical Specifications

• AC Voltage Range: 12 volts to 240 volts (4 levels)
• DC Voltage Range: 1.5 volts to greater than 17 to 24 volts (4 levels)
• Safety Rating: CAT III 250V
• Insulation Class: Class 2 Double Insulation
• Ingress Protection: IP41 Dust and Water Resistant
• Drop Rating: 9.9 feet
• Auto Power-Off: Approximately 2 minutes of non-use
• Battery: 2 x AAA (not included)
• Weight: 3.6 pounds

Standard Information

• Brand: KLEIN TOOLS
• Manufacturer Part Number: ET40