Gold Line/TEF is a U.S. manufacturer founded in 1961 dedicated to the design and manufacture of precision audio measurement equipment. Popular products include a series of impedance meters, DSP audio Spectrum Analyzers, sound level meters, pink and white noise generators, and the everyday working tool of many consultants, the NEW TEF25 analyzer.
The ZM1P has all the features of the ZM1 but adds an Overload Protection Circuit that prevents the meter from being damaged from amplifier output overloads up to 120VAC and a Tone Generator to improve system testing and performance.
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