The Klein Tools ET300 is a digital circuit breaker finder that locates the corresponding breaker for any 120V standard electrical outlet. The transmitter plugs into the outlet and the microprocessor-controlled receiver with a flashing arrow indicator identifies the correct breaker at ranges up to 1000 feet. An auto power-off function conserves battery life. An optional accessory kit (Cat. No. 69411) adds a light socket adapter and alligator clip assembly. This product has been discontinued and replaced by the ET310, which adds an integrated GFCI outlet tester. Backed by Klein Tools' 1-year limited warranty.
Is the ET300 still available?
No — the ET300 has been discontinued and replaced by the ET310.
What did the ET300 do?
It identified which circuit breaker controlled a specific 120V outlet by plugging a transmitter into the outlet and scanning the panel with a handheld receiver up to 1000 feet away.
What replaced it?
The ET310 is the current Klein Tools circuit breaker finder.
# Klein Tools® ET300 Digital Circuit Breaker Finder **Model:** `ET300` **Brand:** Klein Tools **Category:** Voltage Tester > The Klein Tools ET300 is a digital circuit breaker finder that locates the corresponding breaker for any 120V standard electrical outlet. The transmitter plugs into the outlet and the microprocessor-controlled receiver with a flashing arrow indicator identifies the correct breaker at ranges up to 1000 feet. An auto power-off function conserves battery life. An optional accessory kit (Cat. No. 69411) adds a light socket adapter and alligator clip assembly. This product has been discontinued and replaced by the ET310, which adds an integrated GFCI outlet tester. Backed by Klein Tools' 1-year limited warranty. ## Specifications | Attribute | Value | |---|---| | Product Type | Digital Circuit Breaker Finder | | Transmitter Outlet Types | 120V standard electrical outlet | | Operating Voltage | 90–120V | | Transmitter Range Ft | 1,000 | | Receiver Sensitivity Adjustable | No | | Battery Type | 9V | | Overall Length In | 6 | | Assembled Weight Oz | 3.2 | | Barcode (UPC) | 092644693021 | | Warranty | 1-year limited | ## What's Included - 9V transmitter battery Source: https://www.jaspecs.com/klein-tools/voltage-tester/et300-klein-tools-digital-circuit-breaker-finder/