Digital Line Monitor

Catalog Item # 24900

Digitally monitor and meter all your AC power sources for your personal safety and appliance protection.

This compact, easy to use instrument is made with advanced microelectronics and provides accurate testing and monitoring of electrical outlets and systems. Constantly monitors voltage and frequency indicating potential improper polarity and ground wiring. Its small size and rugged construction allows for convenient installation in an electrical outlet or use as a portable service tool.

Voltage is measured as RMS which is much more precise than AC average. RMS metering is the only method that can accurately measure all AC power sources. The RMS voltage and frequency readings are ideal for monitoring modified sine waves such as solid-state generators, inverters and Uninterruptible Power Supply (UPS) products.

The Digital Monitor display will alternate between line voltage in RMS volts and line frequency in Hertz. The LCD display shows an "F" in front of the reading to denote frequency. Pressing the MODE button on the front of the Digital Monitor will cycle through the display modes. Both voltage and frequency are constantly monitored regardless of the display mode.

  • Fully tests incoming power for: Open ground, Reverse polarity, High/Low voltage
  • Three display modes available: Alternating voltage and frequency (VOLT/FREQ.), Voltage only (VOLTAGE),Frequency only (FREQUENCY)
  • Accurate testing and monitoring of all AC power source types
  • RMS voltage and frequency meter
  • Multi-tone fault alarm
  • Hands-free auto reset
  • Advanced microelectronics
  • One-button operation
  • Wiring diagnostics
  • LCD display with LED backlight

  • Technical Specifications

    Less than 1 lb.

    Camper's Choice Rating

    Reviewer rating of 5 stars based on 16 reviews (5 Based on 16 Reviews)

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    120 Volt meter

    by Fred Golden – May 18, 2004
    5 out of 5 stars

    This voltmeter can tell you a lot. If it reads below 105 VAC then shut off your air conditioner. If the voltage climbs by more

    Worth the Price

    by Anonymous – April 06, 2009
    5 out of 5 stars

    So far, this monitor has identifed several low voltage conditions in various campgrounds, has identified a pedistal that had lost

    A must have

    by Eric W. Brown – July 04, 2011
    5 out of 5 stars

    Unlike the other review, this does display the current reading... what is left! Use it all the time. This past week end the alar

    Visual piece of mind

    by Tim Matthews – October 10, 2003
    4 out of 5 stars

    This little guy constantly monitors incoming power and alerts you to high or low voltage conditions as well as incorrect line freq

    Lets you know what you need to know

    by R_Timothy Bickhaus – July 25, 2005
    5 out of 5 stars

    The temperature was over 102 degrees. With the AC running, the breakers blew as soon as my wife turned the microwave on while she

    by Anonymous – May 03, 2016
    This product will display realtime state of Alternating Voltage & Frequency. It does not log any data or determine how much power is being used. A demonstration video for this product can be viewed here.
    by Camping World – May 03, 2016
    Yes, this monitor fully tests incoming power for: Open ground, Reverse polarity, High/Low voltage
    by Camping World – July 31, 2015
    by Gngr26 – March 02, 2015
    The description states "Fully tests incoming power for: Open ground, Reverse polarity, High/Low voltage."
    by Camping World – March 03, 2015

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