FF300 FaultFinder: Open and short circuit finder and tracer (discontinued)

Discontinued – see the FF310 for the new improved model.

Quick Links


  • Short circuit tracing
  • Open circuit tracing
  • Wire identification
  • Wire/Circuit tracing
  • Ground connections checks



  • No Ground or clip required
  • Operates on DC voltages from 6 to 36 volts
  • Internally protected against power surges and overloads
  • 9″ flexible probe allows reaching wires in congested places
  • Transmitter and Receiver LEDs show open or short circuit conditions
  • Variable audio/visual signal provides fast and intuitive feedback on the circuit/wire proximity
  • Adjustable sensitivity for all tracing situations
  • No wire piercing required, non-contact technology!
  • Tracing of wires is made possible even inside bundles, conduits, behind panels, under carpets, upholstery, etc.
  • Transmitter has auto polarity and leads with 5 amps alligator clips



FF300T (Transmitter)

  • Indicators: Green LED for power On and Open circuits. Red LED for short circuits
  • Power source: 9-volt alkaline battery. Duracell type MN1604 (included)
  • Battery life: approx. 50 hrs
  • Connector: Two 5 A alligator clamps with auto polarity and 18″ long cable
  • Physical dimensions: 4.375″ (H) x 2.56″ (W) x 0.937″ (D) – (111 x 65 x 23 mm) – Excluding cable and probes
  • Weight: Approximately 5.6 Oz ( 156 g) Including battery

FF300R (Receiver)

  • Sensitivity: Three user selectable sensitivity levels (low, medium and high)
  • Receiver probe: Flexible 9″ gooseneck insulated steel probe
  • Indicators: Green LED indicator for power on and open circuits. Red LED indicator for short circuits
  • Variable flashing and modulated audible signal
  • Power source: Standard 9-volt alkaline battery. Duracell type MN1604 (included)
  • Battery Life: approx. 50 hrs. Auto Power Off
  • Physical dimensions: 4.375″ (H) x 2.56″ (W) x 0.937″ (D) – (111 x 65 x 23 mm) – Excluding antenna and probe
  • Weight:Approximately 5.2 Oz ( 145 g) Including battery



  Download Manual (English)

Kit Manifest

  • FF300T (transmitter)
  • FF300R (receiver)
  • Hard padded case for carrying and storage
  • User’s Manual


Parts & Accessories