The AMES INSTRUMENTS Pen Voltage Tester with GFCI Diagnosis is the safe and simple way to quickly troubleshoot voltage problems in both residential and commercial applications. Quickly measure AC and DC voltage or check outlets, light fixtures, batteries and extension cords. With a built-in GFCI tester, this voltage meter verifies operation of GFCI protected outlets.

• Automatically indicates DC voltage and polarity, and live AC voltage up to 400V with six levels aligned to commonly used voltages
• Indicates voltage with visual LED light and audible beep alerts
• GFCI tester verifies operation of GFCI-protected outlets
• Simple automatic operation, no batteries required
• Test leads include removable protective cap
• CAT III 400V rated for safe use