Clamp Meters

GAO’s electrical clamp meters are a type of electrical test instrument used to measure electrical current without the need to disconnect the circuit or make physical contact with the conductors. Our clamp meters work by using a magnetic clamp that can be opened and closed around the conductor, which induces a magnetic field in the clamp. This field is then converted into a measurable electrical signal, which is used to determine the current flowing through the conductor. They are particularly useful in situations where the current cannot be easily measured using other types of test instruments, such as when the circuit is live or the conductors are difficult to access.


GAO’s electrical clamp meters are composed of clamp, current transformer, measurement circuitry, display, function selection and range switches, power source, and input jacks.

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GAO Tek’s electrical clamp meters have the following functions:

  • Current Measurement: The primary function of our clamp meter is to measure electrical current. It can measure both AC and DC current by clamping around a conductor and using the built-in current transformer to sense the magnetic field generated by the current.
  • Voltage Measurement: GAO Tek’s clamp meters also provide voltage measurement capabilities. They can measure AC and DC voltages by using test leads or probes connected to the meter's input jacks. This allows users to measure voltage in circuits and electrical systems.
  • Resistance Measurement: Some of our electrical clamp meters have the ability to measure resistance, which is useful for checking the continuity of wires and components or for troubleshooting electrical connections.
  • Data Logging: Our electrical clamp meters come equipped with data logging capabilities. They can store measurements over time, allowing users to analyze trends and diagnose intermittent issues.
  • True RMS Measurement: True RMS (Root Mean Square) measurement capability is a valuable feature in GAO’s electrical clamp meters. It accurately measures the effective value of complex waveforms, including non-sinusoidal signals, which is crucial for obtaining accurate readings in various electrical systems.

GAO Tek’s electrical clamp meters are rugged, versatile, and precision measurement instruments. They comply with applicable industry standards such as ISO 17025: ISO/IEC 17025, CSA C22.2 No. 61010-1, UL 61010-1, and ICE 61010-1.

Our electrical clamp meters help our customers comply with relevant U.S. government regulations such as:

  • Occupational Safety and Health Administration (OSHA) Regulations
  • National Electrical Code (NEC)
  • Federal Communications Commission (FCC) Regulations
  • National Institute of Standards and Technology (NIST)

Our electrical clamp meters help our clients in complying with relevant Canadian government regulations such as:

  • Canadian Electrical Code (CEC)
  • Measurement Canada
  • Canadian Standards Association (CSA)

Our electrical clamp meters have the following applications:

  • Electrical Maintenance and Troubleshooting: GAO’s electrical clamp meters are frequently used by electricians and maintenance technicians for diagnosing and troubleshooting electrical systems.
  • Energy Audits and Power Consumption Analysis: Our clamp meters are used in energy audits to measure current in electrical circuits, helping to assess power consumption and identify energy-saving opportunities.
  • Industrial Control Systems: GAO Tek’s clamp meters are used in industrial control systems to monitor electrical currents in motor control centers, switchgear, and distribution panels. They help ensure that machinery and equipment are operating within design parameters, detect imbalances, and diagnose abnormal current draw that may indicate a malfunction or inefficiency.
  • Automotive and Vehicle Electrical Systems: In automotive and vehicle maintenance, our clamp meters are used to measure current in various electrical systems such as batteries, alternators, and starter motors. They assist in diagnosing charging system issues, identifying parasitic battery drains, and assessing the health of electrical components.
  • Renewable Energy Systems: Our clamp meters find application in renewable energy systems, including solar photovoltaic (PV) and wind power installations. They are used to measure current in inverters, charge controllers, and battery systems, aiding in system performance evaluation and troubleshooting.
  • Research and Development: GAO’s clamp meters are utilized in research and development environments to measure current in prototype circuits, conduct experiments, and validate electrical designs.

Our electrical clamp meters can be shipped overnight within the continental U.S. and Canada, and can be shipped globally.

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ID: GT00Z600ZX

This AC and DC clamp meter is specially designed for measuring AC/DC current and leakage current with modern CT technology and digital integration technology.
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ID: GT00Z600ZT

This AC clamp meter is specially designed for measuring AC current and AC leakage current and comes with an on-line AC current measuring system with a wide measuring range of current from 0mA~600A.
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ID: GT00Z600ZW

This highly accurate AC and DC clamp meter with non-contact measurement is specially designed for measuring AC/DC current, leakage current, and repairing the car circuit leakage up to 600 V line voltage
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This clamp meter with AC and DC Current enables measurement of online AC/DC leakage currents whose voltage is below 600 V.
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ID: GT00Z600ZU

This high accuracy AC clamp meter is specially designed for measuring AC current, AC leakage current, and on-line current measuring systems with wide measuring range of 0 mA ~ 300 A
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ID: GT00Z600ZV

This light-weight DC clamp meter measures DC leakage and low current with a resolution of up to 0.01 mA.
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This Portable H/L Voltage Clamp Current Leaker measures high voltage current with a 12.5 in (32 cm) insulating rod, adopting the latest CT technology and integrating mask digital technology.
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This three-channel leakage current tester provides online measurement, monitoring, and recording of three channel AC leakage currents at the same time by adopting the latest CT and magnetic shielding technology.
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This H/L Voltage Clamp Meter with Data Memory provides high precision and high voltage current measurement by adopting the latest CT and integrated mask digital technology.
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This H/L Voltage Clamp Meter is designed for measuring high voltage currents and comes with wireless receivers which can receive measured data within a 0.01 mi (30 m) line.
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This H/L Voltage Clamp Current Meter is used as a high-precision, low-voltage clamp meter and as a leakage current meter, measuring the current or leakage current of 0.01 mA, respectively.