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TOA ZM-104A Impedance Meter
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    TOA ZM-104A Impedance Meter

    Manufacturer: TOA Electronics, Inc.

    Item #: ZM-104   •   MFG #: ZM-104A

    Availability: Direct Ship From Manufacturer
    Item ships directly from the manufacturer. Normal delivery time is 2-7 business days and is subject to manufacturer availability. Need it sooner? Call 800-522-2025, or email Customer Service for expedited delivery options.
    • 2 - 7 Day Normal Delivery Time - Faster Shipping Options at Checkout or Call Us.



    The TOA Impedance Meter, ZM-104, has been designed to measure impedances in the speaker lines in sound systems. It is fully portable and is operated from internal batteries. This handy meter provides accurate direct readings in the manner of a circuit meter, simply by disconnecting the speaker line from the amplifier and connecting it to the measuring leads.

    The range selector switch allows selection of three ranges, from five to one hundred thousand Ohm. Each time the range selector switch is transferred, zero Ohm adjustment is necessary before operation.

    Its accuracy is less than plus or minus ten percent on all ranges. The ZM-104 requires one battery change only after more than 30 hours of continuous use.

    The ZM-104 is supplied with a convenient Impedance Output Chart.

    The entire unit is sturdy, light and easy to carry. It weighs a mere 2 pounds.

    • Features

      • Measures impedance of speaker lines up to 100k ohms
      • Batteries: four (AA)
      • Zero adjustment for accuracy on all ranges
      • Easy to read meter calibrates directly in ohms
      • Includes carrying case, test leads and impedance to power reference chart
      • Five year warranty


    by PowerReviews
    TOA ELECTRONICS, INC.TOA ZM-104A Impedance Meter

    (based on 1 review)

    Ratings Distribution

    • 5 Stars



    • 4 Stars



    • 3 Stars



    • 2 Stars



    • 1 Stars



    Reviewed by 1 customer

    Displaying review 1

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    ZM-104A Best Speaker Line Analyzer

    By LG

    from Central Illinois

    About Me Experienced

    Verified Reviewer


    • Durable
    • Easy To Use
    • Lightweight
    • Quick Testing Very Reliable


    • Meter Leads A Bit Short Easily Remedied

    Best Uses

    • Speaker Line Test Repair

    Comments about TOA ELECTRONICS, INC. TOA ZM-104A Impedance Meter:

    Maintained Medical Center PA Sys for 24 Yrs. This made testing/repair very easy.

    Displaying review 1

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