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This section provides an overview for clamp meters as well as their applications and principles. Also, please take a look at the list of 32 clamp meter manufacturers and their company rankings. Here are the top-ranked clamp meter companies as of December, 2024: 1.Greenlee, 2.Allied Electronics, Inc., 3.Sperry Instruments.
Table of Contents
A clamp meter is a measuring instrument designed to measure the current flowing through a cable by clamping onto the cable with a head that encloses it.
Unlike traditional methods that require direct connection to the circuit under test, a clamp meter has minimal impact on the circuit and can safely measure large currents. Typically, when measuring current in a wire or cable, the circuit must be disconnected, and an ammeter is inserted to measure the current.
However, this process can be cumbersome, which is why clamp meters are now commonly used for current measurements during electrical equipment inspections. In the past, analog models displayed measurements on a meter, but today, digital models that provide numerical readouts on a display have become the norm.
While clamp meters may offer additional functions like voltage and resistance measurement, this article will focus solely on current measurements.
Clamp meters find their primary use in measuring current during various electrical construction and inspection tasks in residential and commercial settings. The primary objective is to measure current in a cable without the need to cut the cable.
One significant advantage is that there is no need to disconnect the cable during measurements, allowing current measurements to be taken while lighting and equipment continue to operate as usual. Highly sensitive models can even measure minute currents, including leakage currents flowing from equipment to ground.
Clamp meters operate based on the principle of a transformer. The head that clamps onto the cable acts as the core of the transformer and is constructed from a highly permeable magnetic material (usually iron-based material such as Permalloy). A transformer can convert an alternating current on the primary side into voltage or current on the secondary side according to the turns ratio between the primary and secondary windings.
When a cable with current flowing through it is placed inside the core, it functions as the primary winding of the transformer. A coil equivalent to the secondary winding is also present in the head, allowing the current value to be measured and the current flowing in the cable to be calculated.
However, this method cannot measure DC current because no current flows in the secondary winding. For this reason, in AC/DC dual-use, clamp meters employ a head with a hall element embedded in the core. The hall element generates a voltage corresponding to the magnetic flux density, using the hall effect, for both DC and AC. This voltage is measured to calculate the current flowing through the cable.
Using clamp meters is straightforward: simply clamp the cable between the heads. Placing the cable in the center of the head minimizes measurement errors, but slight deviations do not significantly affect accuracy.
When measuring DC current, pay attention to the direction of the current flow in the cable. Most clamp meters have symbols marked as "+" and "-", indicating the current direction. Current flowing from "+" to "-" is considered a positive current value, while current flowing from "-" to "+" is negative.
When measuring current in a device, either the outgoing or return cables pass through the clamp meter's head. If leakage current is present within the equipment, some current will flow to the ground, resulting in a slightly lower current on the return path compared to the outgoing path.
This difference generates a magnetic flux density, which is displayed on the clamp meters and is equal to the magnitude of the leakage current. This principle allows for the measurement of equipment leakage currents. As these currents typically range from several mA to tens of mA, the clamp meters used should have a sensitivity of about 1 mA.
When measuring currents in parallel cables with clamp meters, accessories such as line separators can be employed to separate the parallel cables, simplifying measurements. Additionally, using a wireless adapter that directly transfers measurement data to a PC via wireless communication is highly advantageous in preventing data transcription errors during fieldwork.
*Including some distributors, etc.
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Tinsley Instrumentation Ltd established in Braintree, Essex in 1904 is a manufacturer of precision measurement equipment such as transformer testers and submarine cable equipment. Their product portfolio includes clamp meters, Transformer Test Equipment, Decade Resistance Boxes, Resistance Measurement, and Portable Bridges. The company's products are used in research and development laboratories for conducting experiments, analyzing data, and prototyping new technologies. The company has a national distribution network and a customer and technical support center.
IDEAL Electrical, originally founded in 1916, is part of IDEAL INDUSTRIES, INC., is a manufacturer of wire connectors, tools, conduit benders, fish tapes and countless other products based in America. More than 6,000 tools and supplies make up the company's family of products with a state-of-the-art delivery system around the world. Their complete line includes Twist-On Wire Connectors, Push-In Wire Connectors, Grounding Wire Connectors, DataCom Wire Connectors, among others. Their line of electrical wire connectors is built to provide safe and dependable solutions for every application, whether it’s residential, commercial or industrial.
Headquartered in Everett, Washington, Fluke is an American-born company operating since 1948. Fluke offers a variety of testing equipment including digital multimeters, thermal cameras, solar PV testing equipment, thermometers, oscilloscopes, leak detection devices, as well as testing-equipment related accessories. Fluke offers direct online sales.
OMEGA Engineering Inc., founded in Norwalk, CT, in 1962 is a manufacturer of products used to measure temperature and humidity, flow and level, and pressure. The company's product portfolio includes thermocouple probes and assemblies, pressure gauges and switches, and air velocity measurement systems, wireless systems and portable optic sensors. The company serves markets including Automotive and Electric Vehicles, Renewable Energy and Energy Storage and Electronics and IT Infrastructure. The company also offers customer services that include support, custom research projects and customized services.
L-com was founded in 1982 and is headquartered in North Andover, Massachusetts. The company serves many industries including electronics, medical, industrial automation, military, and telecommunications a manufacturer and servicer of wired and wireless communications products. The company’s custom product capabilities include customized cable assemblies, WiFi antennas, adapters, and surge protectors. Through its parent company, Infinite Electronics, the company offers a broad range of RF components and assemblies to over 100,000 global customers.
Greenlee Textron, Inc., founded in 1862, operates as a significant manufacturer in the industrial and electrical tool industry. The company provides a range of products and solutions related to warehousing, transportation, and general storage. As a key contributor in the machinery manufacturing sector, Greenlee Textron, Inc. offers power-driven hand tools and other general purpose machinery, addressing various industrial needs. The company's business in multiple locations, including Rockford, IL, and Southaven, MS, underscores its run to serving diverse sectors and fulfilling the requirements of professionals worldwide.
Allied Electronics Inc., founded in 1991 with headquarters in the USA, is a distributor and supplier of fuel and vehicle servicing station equipment and accessories. The company's extensive product line of over 57,000 products includes forecourt controller parts, fuel dispenser parts, air compressors, and power conditioners. The company also provides rebuilt parts by brands that include Bennett, Daktronics, FE-Petro, and Gasboy. The company's services include equipment financing, primarily serving the retail petroleum industry, including car wash and price sign manufacturers.
Sperry Instruments, established in Hauppauge, New York, in 1966, is a supplier of testing and measurement equipment for the electrical marketplace. Their product portfolio includes Scanners, Circuit breaker finders and wire tracers, Non-contact and probe voltage testers, Voltage-continuity and insulation testers and Outlet Testers. Their products are used for commercial solutions, data solutions, renewable energy, and power utilities. The company has distributors in the USA and Canada, and provides nationwide customer support.
Seaward Electronic Ltd, since 1982 is a manufacturer of electrical safety test equipment and software headquartered in Peterlee, United Kingdom, with an additional office in Tampa, Florida. The company’s product portfolio includes portable appliances, solar PV, manufacturing, medical device, and high-voltage testers. They offer various medical equipment testers such as electrical safety analyzers, patient simulators, defibrillator analyzers, and electrosurgical analyzers. They offer various electrical testers for testing resistance such as milliohmmeters, microhmmeters, and decade resistance boxes, and high voltage such as phasing sticks, voltage indicators, and safe discharge rods.
Yokogawa Test & Measurement Corporation was founded in Japan in 1954. Yokogawa currently serves a wide array of industries including the aerospace, automotive, consumer electronics, semiconductor and telecommunications industries with both hardware and software solutions. Among Yokogawa’s suite of products are oscilloscopes, voltage probes, power analyzers and meters, data acquisition tools, optical test equipment, a wide variety of handled meters, calibrators, and testers; analog instruments, and manometers.
Zhejiang CHINT Instrument & Meter Co., Ltd. (Chint Meter), founded in 1998 and currently a subsidiary of Zhejiang Chint Electrics (CHINT Group), is a Chinese manufacturer headquartered in Hangzhou, Zhejiang, specializing in smart metering solutions. The company's product portfolio includes energy meters, such as electromechanical meters, single-phase prepaid and smart meters, three-phase prepaid and power meters, three-phase energy meters, and smart energy meters. The company also provides both smart and mechanical gas meters, alongside various water meters. The company further extends its offerings to industrial instruments, featuring analog and digital panel meters, portable meters, as well as humidity and temperature meters.
Founded in 1940, Kyoritsu has an 80 year history as a customer-focused organization specializing in multimeters. Kyoritsu provides analog multimeters as well as digital multimeters with and without clamps offering many varieties of measurement.
OWON - Fujian Lilliput Optoelectronics Technology Co., Ltd is based in China since 1990 as a manufacturer and supplier of test and measurement equipment. The company produces Digital Oscilloscopes available as handheld, virtual, tablet, and benchtop types as well as probes. They have Single Channel and Dual Channel Waveform Generators, along with Digital Multimeters and Programmable DC series Power Suppliers. There are also different types of Thermal Imagers, Spectrum Analyzers, and Anenmo Meters that can provide more than one kind of measurement.
DER EE Electrical Instrument Co. Ltd., established in 1981 and based in New Taipei City, Taiwan, is a manufacturer of test and measuring instruments. Its product portfolio includes digital multimeters, thermometers, and insulation resistance testers, and the company is ISO 9001, ISO 14001, and ISO 45001 certified. Its clamp meters are engineered for non-contact current measurement and can troubleshoot electrical circuits without disconnection. Its DE-721 and DE-721B models of phase sequence testers have a three-phase system measurement ranging from AC 90 V to AC 600 V with magnetic bases that allow them to be mounted on metal.
Mextech Technologies Pvt. Ltd., established in 2013 in India, is a specialized manufacturer of precision testing and measuring tools and equipment. The company's range of portable and professional measuring products includes a wide range of handheld water activity meters, coating thickness gauges, analog clamp meters, and digital force gauges. Mextech Technologies Pvt. Ltd.'s products are used both by individual trade professionals, companies, and research organizations. The company also offers direct sales and delivery, maintenance, repair, and support services.
Dongguan Habotest Instrument Technology Co., Ltd, formed in 2018 and based in Dongguan, China, is a manufacturer of a broad collection of measuring products. The company specifically produces handheld digital multimeters, digital clamp meters, pen-type voltage testers, plug socket testers, and environmental testers. It also manufactures handheld digital anemometers, digital wood moisture meters, smart gas leak detectors, digital lux meters, and digital decibel meters. Its handheld digital multimeters can measure voltage between 0-600 V, measure current between 0-600 A, measure resistance between 0-60M ohms, and measure capacitance between 0-9.99 mF.
Amprobe, founded in Everett, WA, in 1948 is a manufacturer of Ultrasonic Leak Detectors. The company's product portfolio includes battery testers, Electrical and HVAC Test and Measurement Tools, Digital Multimeters, Clamp Meters, and Wire Tracers & Cable Locators. The company serves industries such as Oil and Gas, Aerospace and Defense, Automotive and Transportation, Construction, and Power Generation. They also provide services including product selection, installation, preventative maintenance, troubleshooting, and repair.
Milwaukee Electric Tool Corporation, established in 1924 and headquartered in Brookfield, Wisconsin, is a manufacturer and marketer of heavy-duty, portable electric power tools and accessories for professional users. The company offers a wide range of products including cordless power tools, outdoor tools, hand tools, PPE, workwear, and more. It also offers a range of personal protective equipment including safety glasses, gloves, and respirators. Its product allows users to transfer tools and equipment from the crib to the job site and from one job site to another. It serves several industries, including construction, plumbing, electrical, carpentry, and welding.
Tinsley Instrumentation Ltd., established in 1904 and based in Essex, England, is a manufacturer and supplier of precision measurement and portable test and measurement equipment. The company's product portfolio includes transformer test equipment, insulation testers, and decade resistance boxes. These products find application in various industries, including industrial manufacturing, telecommunications, and power generation and distribution. The company offers services including technical support, customization, and ordering and logistics. The company exports its products to various countries, including the United States, China, and South Africa.
Amprobe Instrument Corporation, began life in Long Island, NY in 1948 under the name Pyramid Instrument Company, later renamed in1960, is a manufacturer and builds rugged test and measurement tools. The company was acquired by the Danaher Corporation and moved its worldwide headquarters to Everett, Washington in 2006. It designs, manufactures and distributes products from an extensive line of clamp meters and digital multimeters to industry-specific tools for residential/commercial electricians, HVAC/R technicians, utilities and industrial maintenance professionals. Its tools undergo rigorous and intensive testing to ensure compliance with the latest regulations in Fluke's CSA-recognized lab for safety and accuracy.
Hoyt Electrical Instrument Works Inc., established in 1904, is a manufacturer of analog and digital panel meters, transformers, shunts, switches, and personal safety devices, located in Penacook, New Hampshire, the United States. The company’s products are designed to meet and exceed industry standards. It offers a wide range of test and measurement instruments, making its a comprehensive solution for customers’ needs. It is not only an analog panel manufacturer, but also has evolved to provide value-added custom solutions that keep the world spinning in the right direction.
Santronics, Inc., with 19 patents, was established in 1989 and based in North Carolina, United States, as a manufacturer of electronic components. The company offers products such as sensors, locators, testers, detectors, and multimeters. These products are supplied to different industries including residential, marine, automotive, HVAC, electrical, and telecommunication sectors. The OSHA electrical technical equipment committee recommends the Santronics' AC sensor as the instrument to identify electrical hazards of 50 volts and above.
Benning, founded in 1938 and based in Germany, is a developer and manufacturer of OEM power supplies, electrical machines, testing measuring, and safety equipment. These products include UPS systems, traction motors, charging stations, appliance testers, and digital multimeters. The products offered by the company are used in the medical, power, distribution, water treatment, mining, and telecommunication sectors. The company also runs service centers for electrical machines to perform system checks, preventative maintenance, and calibration processing.
Milwaukee Tool, established in 1924 and headquartered in Brookfield, Wisconsin, USA, is a manufacturer of heavy-duty power tools, hand tools, and accessories The company offers a wide array of accessories, such as bits, blades, and sockets, to complement their cordless and corded power tools, including hammer drills, saws, and wrenches. Milwaukee Tool's products are utilized by construction workers, mechanics, electricians, and contractors for various tasks, including drilling, sawing, fastening, vehicle repairs, electrical installations, and construction projects.
Fieldpiece is a developer and manufacturer of professional-grade tools for the HVACR sector, incorporated in 1990 and headquartered in Anaheim, California. The company has over 200 products covering electrical meters, air flow and temp/RH, digital manifolds, leak detectors, and combustion testers and analyzers. These products are designed to measure and diagnose heating, ventilation, air conditioning, and refrigeration (HVACR) systems. The company also provides services to its customers, including technical support, product training, repairs, and calibration. It has operations in the US, UK, and Europe.
Multi Measuring Instruments Co., Ltd. was founded in Chiba, Japan in 1986 and is headquartered in Tokyo. As per its namesake, Multi offers a vast array of measuring and testing equipment used across a number of industries. Some of their offerings include voltage meters, network testers, lux meters, cable locators, sound meters, various thermometers, gas analyzers, and water quality meters. Multi Measuring Instruments has a mission for its products to improve the global environment by detecting inefficiencies and leaks, developing products that will be useful for solar and wind power generation.
Klein Tools is a fifth-generation family-run producer of hand tools founded in 187 and headquartered in Lincolnshire, Illinois. Klein Tools sells worldwide directly and through distributors. Klein Tools has a family of companies under its brand including Alco, Civitella, Mumme Tools, Tulmex, and Wattmaster. Klein Tools serves several industries including construction, HVAC/R, plumbing, telecom, municipal, and industrial. Some of the tools Klein Tools produces include non-contact voltage tester bens, multi-bit screwdrivers, digital circuit breaker finders, advanced circuit tracer kits, and multi-bit electronics screwdrivers.
Value Tronics International Inc., founded in 1992 and based in Elgin, Illinois, is a distributor of a wide range of equipment, such as signal generators, power supplies, and spectrum analyzers. The company stocks over 8,000 products, including used and new equipment from over 300 manufacturers like Berkeley Varitronics, Compression Techniques, and Delta Elektronika. It also buys obsolete and unused testing and lab equipment, which includes meters, oscilloscopes, and data loggers. The company provides financing options that allow customers to pay for purchases later. It also has a loyalty program where customers earn a 2% credit after a purchase.
Gao Tek Inc., started in 2001, and headquartered in Manhattan, New York, is a supplier of test and measurement equipment like embedded development tools, electronic measurement instruments, and telecommunication testers. The company is a B2B tech supplier that also stocks drone products, commercial gas detectors, and transceivers and is incorporated in the USA and Canada. It provides a one-year product warranty against defective material or workmanship and offers overnight delivery in the continental USA and Canada. It is a member of the GAO group and has served customers in over 50 countries worldwide.
Sifam Tinsley UK is based in London, England, United Kingdom, and is a supplier of electrical control and monitoring products for industrial automation that was established in 1946 as a subsidiary of Sifam Tinsley Instrumentation. The company’s product inventory includes digital and analog panel meters for measuring AC and DC voltages or currents, power quality analyzers for gauging parameters such as harmonics or flicker, and transducers for converting electrical signals into digital or analog inputs. The company’s products are commonly used by clients in Europe’s marine, power generation, and mining industries.
Inspector Tools, founded in 1999 and based in Ventura, California, is a distributor and supplier of test equipment catering to sectors such as facility maintenance, building inspection, and energy conservation. The company maintains a diverse inventory featuring products from over 20 brands, including Extech Instruments, Met One Instruments Inc., and General Wire Spring Company. Offerings range from home inspection kits to carbon monoxide detectors and infrared cameras. Inspector Tools provides customers with an online catalog showcasing its entire product range. Additionally, customers can create digital accounts for faster checkouts and access to order history.
Ranking as of December 2024
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | BENNING Elektrotechnik und Elektronik GmbH & Co. KG |
13.6%
|
| 2 | FLUKE Corporation |
11.4%
|
| 3 | Sperry Instruments |
9.1%
|
| 4 | Santronics, Inc. |
4.5%
|
| 5 | Fieldpiece |
4.5%
|
| 6 | Greenlee |
4.5%
|
| 7 | Allied Electronics, Inc. |
4.5%
|
| 8 | Zhejiang Chint Instrument & Meter Co., Ltd |
4.5%
|
| 9 | Milwaukee Tool. |
4.5%
|
| 10 | Tinsley Instrumentation Ltd. |
2.3%
|
Derivation Method
The ranking is calculated based on the click share within the clamp meter page as of December 2024. Click share is defined as the total number of clicks for all companies during the period divided by the number of clicks for each company.Number of Employees
Newly Established Company
Company with a History
*Including some distributors, etc.
*Including some distributors, etc.
| Country | Number of Companies | Share (%) |
|---|---|---|
|
United States of America
|
8 | 44.4% |
|
Japan
|
4 | 22.2% |
|
China
|
3 | 16.7% |
|
United Kingdom
|
1 | 5.6% |
|
Taiwan
|
1 | 5.6% |
|
India
|
1 | 5.6% |
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4 models listed
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