The Klein Tools RT600 is a USA-made GFCI receptacle tester for standard North American 120V outlets. It detects common wiring faults including open ground, reverse polarity, open hot, open neutral, and hot/ground reversed, and tests GFCI devices with a built-in test button. Features include large LED indicators, reinforced prongs, and a push-pull design with slip-resistant ribbing. Manufactured in the USA using domestic and imported components. This product has been discontinued. Backed by Klein Tools' 1-year limited warranty.
Is the RT600 still available?
No — the RT600 has been discontinued. The current GFCI-only outlet testers are the RT210 (no battery, LED) and RT250 (LCD, battery).
What made the RT600 distinctive?
It was manufactured in the USA — the only Klein Tools outlet tester with that designation, and a feature called out directly in the product name. Buyers who prioritize domestic manufacturing specifically sought it out.
Does the RT600 need batteries?
No — it drew power directly from the outlet under test.
Is there a USA-made successor?
No current Klein Tools outlet tester carries a USA-made designation. The RT210 and RT310 are the active functional equivalents.
# Klein Tools® RT600 GFCI Receptacle Tester USA Made **Model:** `RT600` **Brand:** Klein Tools **Category:** Voltage Tester > The Klein Tools RT600 is a USA-made GFCI receptacle tester for standard North American 120V outlets. It detects common wiring faults including open ground, reverse polarity, open hot, open neutral, and hot/ground reversed, and tests GFCI devices with a built-in test button. Features include large LED indicators, reinforced prongs, and a push-pull design with slip-resistant ribbing. Manufactured in the USA using domestic and imported components. This product has been discontinued. Backed by Klein Tools' 1-year limited warranty. ## Specifications | Attribute | Value | |---|---| | Product Type | GFCI Receptacle Tester | | Voltage Range Ac | 120V AC | | Tests Gfci | Yes | | Tests Afci | No | | Outlet Types Tested | 3-wire 120V standard receptacle | | Display Type | LED | | Battery Required | No | | Overall Length In | 2.8 | | Country of Origin | USA | | Barcode (UPC) | 092644694059 | | Warranty | 1-year limited | Source: https://www.jaspecs.com/klein-tools/voltage-tester/rt600-klein-tools-gfci-receptacle-tester-usa-made/