Klein Tools ET40 is an Electronic AC/DC Voltage Tester. It measures AC voltages from 12V to 240V and DC voltages as low as 1.5V up to 24V. Tester also indicates positive and negative DC polarity.Features DC Polarity Indicators for DC Positive, DC Negative, and Both Illuminated for AC. Tests Low DC Voltage to 1.5V. Built in Test Lead Holders on Sides of Tester. Bright LEDs illuminate to indicate the type and level of voltage detected Identifies and distinguishes between AC or DC voltage 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 Uses 2 x AAA batteries (included) Ingress protection IP41 dust and water resistant Built to withstand a 9.8-Foot (3 m) drop CAT III 250V, Class 2, Double insulation Powers off automatically after approximately 2 minutes of non-use to conserve battery life Built-in test lead holders on sides of tester Low battery indicator with easily accessible battery compartment Indicates polarity when measuring DC voltages Pocket clip secures tester to pocket for reliable everyday carrying Warnings Never use the tester on a circuit with voltages that exceed the category based rating of this tester. Read, understand, and follow all instructions, cautions and warnings attached to and/or packed with all test and measurement devices before each use. Usage of this tester in any way other than that specified by the manufacturer can impair safe operation, resulting in severe injury or death. Always adhere to local and national safety codes. Use personal protective equipment to prevent shock and arc blast injury where hazardous live conductors are exposed. Before each use, verify tester operation by measuring a known voltage. Voltage: AC Level Indicators - 12V, 24V, 120V, 240V; DC Indicators - 1.5V, 9V, 12V, >17-24V Accuracy: Approximately 70-100% Indicated Voltage; 2V DC (84-100%); >17V DC (94-100% of 17V) Frequency: 50/60 Hz Drop Protection: 9.8 ft (3 m) Height: 5.24 in (13.3 cm) Width: 1.52 in (3.9 cm) Depth: 5.24 in (13.3 cm) Overall Width: 1.11 in (2.8 cm) Overall Length: 5.24 in (13.3 cm) Overall Height: 1.52 in (3.9 cm) Lead Length: 9 in (22.9 cm) Weight: 0.268 lbs (121 g) Material: Plastic Housing, PCB with Electronic Components Ingress Protection: IP41 Compliance: CAT III 250V, CE Pollution Degree: 2 Batteries: 2 x AAA DownloadsSpec SheetSafety Data SheetInstructionsET40-Manual - WEB.pdf