Impedance Meter / Signal Gen. IM-SG+ (Plus)

Some Uses:

• Precision AC Impedance Meter - Frequency range: 10hz-20khz
• All New Auto-lock feature does the stopping (top or bottom) for you! 
• Low, Mid, High frequency range for more precision.
• New, Super smooth operation of the frequency knob
• Min/Max impedance hold function
• Obtain a driver's T/S Parameters*
• Quickly and safely locate stock speakers (and locations) in the vehicle. 
• Determine speaker crossover set points
• Find tuning frequency of passive radiator
• Quickly determine frequency of any enclosure (sealed, ported, bandpass, etc) using Auto-lock
• Quickly find the Fs of any speaker using auto-lock for proper tuning of that driver.
• Find box volume, even odd shaped sealed enclosures!
• Test impedance of long wire runs 
• Test impedance of RCA Cables (down to 10milliohms)
• Find crossover frequency of passive crossover networks**
• Locate annoying rattles in vehicle
• Easily output any frequency to an amplifiers input, and amplify it.
• Quickly and easily determine frequency changes to an enclosure after modifying the volume or adding/removing polyfill
• Pink noise generator
• Used in conjunction with an SMD AMM-1, quickly determine "box rise" at a specified frequency.
• Improved battery life, Double that of the original IMSG!