Fisher F75 Metal Detector

F75 Specifications

• Mechanical: S-rod with electronics housing mounted on handgrip, 3-piece breakdown, batteries under elbow, 2-way armrest adjustment —
  forward/backward & around forearm.
• Searchcoil: 11” (28 cm) open-frame elliptical double-D, waterproof.
• Batteries: 4 AA, alkaline (not included).
• Weight: 3.5 pounds (1.6 kg) with alkaline batteries installed.
• Static Balance: force in vertical plane normal to elbow 0.47 pounds (0.22 kg).Varies with adjustment and user’s stance and arm/hand physiology.
• Dynamic Balance: axial moment, 0.29 foot-pounds (0.39 newton-meters). Varies with adjustment and user’s stance and arm/hand physiology.
• Sweep Effort: lateral moment 5.2 foot-pounds (7.1 newton-meters).
• Operating Principle: VLF induction balance
• Operating Frequency: nominal 13 kHz, quartz crystal timing reference
• Basic Sensitivity: 6 x 10 9 root Hertz (detectivity)
• Lag Coefficient: 78 milliseconds
• Reactive Overload: approximately 10,000 micro-cgs units (volume susceptibility)
  40,000 micro-cgs units with sensitivity < 30.
  Resistive Overload: approximately 1,200 micro-cgs units (volume susceptibility)
  4,800 micro-cgs units with sensitivity < 30.
• Ground Balancing Range: From ferrite to salt, inclusive
• Discrimination Ground Suppression: combination of second and third order methods
• ID Ground Suppression: third order
• Battery Life: Typically 40 hours with high quality alkaline batteries
  Estimated 80 hours with nickel oxyhydroxide batteries
  Estimated 65 hours with lithium iron disulfide batteries
• Operating Temp Range: 4 to +122 degrees F (-20 to +50 degrees C)
• Operating Humidity Range: 0-90% non-condensing