Klein® Tools ET40 | Electronic AC/DC Voltage Tester

SKU: TO-KET40 Categories: , ,


  • Tests 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 9.9-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


Application Measures AC/DC voltage
Special 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.
Material Plastic Housing, PCB with Electronic Components
Batteries 2 × AAA
Drop Protection 9.9ft (3.0 m)
Display Analog LED
Control Type ON/Off Switch for Power ON/OFF
Voltage AC Level Indicators: 12V, 24V 120V, 240V and DC Indicators:1.5V, 9V, 12V, >17-24V
Frequency 50/60 Hz
Ingress Protection IP41
Pollution Degree 2
Tests Continuity No
Integral Lead Storage Yes
Interchangeable Leads No
Lead Length 9 inches (228.6 mm)
Standard CATIII 250V, CE
Case Included No
Included Tester, User Manual, and 2 × AAA Batteries
Weight w/Batteries 3.1 oz (90 g)
Overall Length 5.24 inches (133.0 mm)
Overall Height 1.52 inches (39.0 mm)
Overall Width 1.11 inches (28.0 mm)
Weight 2.3 oz (66g)

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