Klein Tools ET40 is an Electronic AC/DC Voltage Tester. It features indicators for positive and negative DC polarity, and tests DC voltages as low as 1.5V. It tests AC voltages 12-240VAC. Excellent for checking, verifying or troubleshooting common residential electrical wiring in electrical outlets, light fixtures, doorbells and more. It operates on 2 x AAA batteries.

• Voltage Tester for AC voltages from 12V to 240V AC at four useful levels aligned with commonly used residential voltages.
• Tests DC voltages from 1.5V to greater than 17 to 24V at four useful levels aligned with commonly used DC voltages.
• Bright LEDs illuminate to indicate the type and level of voltage detected.
• Built to withstand a 9.8-Foot (3 m) drop.
• Indicates polarity when measuring DC voltages.
• Powers off automatically after approximately 2 minutes of non-use to conserve battery life.
• CATIII 250V, Class 2, Double insulation.
• Ingress protection IP41 dust and water resistant.
• Built-in test lead holders on sides of tester.
• Low battery indicator with easily accessible battery compartment.
• Pocket clip secures tester to pocket for reliable everyday carrying.
• Uses 2 x AAA batteries (included).
• Identifies and distinguishes between AC or DC voltage.