Fluke ST120+ GFCI Electrical Outlet Tester

The Fluke ST120+ GFCI Socket Tester helps you quickly verify correct wiring and GFCI outlet operation with confidence. Plug it into a standard 110-125 V AC socket and view the bright LEDs to identify one of six wiring conditions including open ground, open neutral, hot/ground reversal, and more.

An integrated beeper alerts you when voltage is detected, making breaker tracing faster and smarter. The one-touch GFCI test button confirms functional protection with ease. With CAT III 300 V rating and a rugged build, this tester is perfect for electricians, HVAC techs, and contractors working in residential or commercial settings.

Find the Fluke ST120+ at Discount Builders Supply & Hardware in San Francisco. Shop online or visit our Mission District store for local pickup and expert assistance.

Key Features

• Detects six common wiring faults including open ground, open neutral, and hot/ground reversal
• Integrated beeper provides audible voltage alert for faster breaker tracing
• One-touch GFCI test verifies proper outlet protection
• Bright, easy-to-read LED indicators show clear wiring status
• CAT III 300 V safety rating for residential and commercial use
• Compact, durable design fits easily in tool belts and pouches