Klein Tools ET40 Electronic Tester, 12 to 240 V AC Voltage, 1.5 to >17 to 24 V DC Voltage, Analog LED Display

The Klein Tools ET40 is an electronic AC/DC voltage tester designed for electricians, homeowners, and maintenance professionals who need to verify electrical circuits safely and accurately. Whether you're checking outlets, light fixtures, doorbells, or troubleshooting residential wiring, this tester quickly identifies voltage presence, type, and level with bright LED indicators. It helps you work more efficiently by clearly displaying whether you're measuring AC or DC voltage and at what level.

The built-in DC polarity indicator shows whether voltage is positive or negative, making DC circuit troubleshooting faster and safer. The water-resistant construction (IP41 ingress protection) prevents moisture from affecting measurements on job sites or in damp environments. The rugged housing withstands drops up to 9.8 feet, ensuring reliable performance even in demanding conditions.

Features and Benefits

• AC and DC Voltage Testing: Tests AC voltages from 12V to 240V and DC voltages from 1.5V to over 17-24V across four useful levels aligned with common residential and DC applications.
• DC Polarity Indication: Quickly determines positive and negative DC polarity, making electrical troubleshooting efficient and reducing diagnostic time.
• Bright LED Indicators: LEDs illuminate to indicate the type and level of voltage detected.
• Built-in Test Lead Holders: Conveniently located test lead holders on the back are spaced for standard US-style outlets and provide easy storage between uses.
• Durable and Water-Resistant: IP41 ingress protection keeps dust and moisture out, with 9.8-foot drop protection for jobsite reliability.
• Safety Ratings: CATIII 250V, Class 2, Double Insulation rating meets industry safety standards for protected operation.

Specifications

• Brand: Klein Tools
• Model: ET40
• AC Voltage Range: 12V to 240V
• DC Voltage Range: 1.5V to over 17-24V
• DC Polarity: Positive and Negative Indicators
• Display: LED Illumination
• Safety Rating: CATIII 250V, Class 2, Double Insulation
• Ingress Protection: IP41 (Dust and Water-Resistant)
• Drop Protection: 9.8 feet (3 meters)
• Power: 2 x AAA Batteries (not included)
• Dimensions: 5.24 x 1.52 x 1.11 inches
• Weight: 0.144 lb
• Color: Orange