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This section provides an overview for illuminometers as well as their applications and principles. Also, please take a look at the list of 14 illuminometer manufacturers and their company rankings. Here are the top-ranked illuminometer companies as of April, 2026: 1.PROMAX Test & Measurement SLU, 2.TechnoOptis Co., Ltd., 3.Testo SE & Co. KGaA.
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Categories Related to Illuminometers
An illuminance meter is a machine that measures the brightness of a place.
In our daily lives, schools, workplaces, etc., it is necessary to have appropriate illuminance in our work environment. Illuminance is expressed in units of lux. There are two types of illuminance meters: the photocell type, which does not require a power supply, and the photoelectric tube type, which can measure illuminance down to low levels.
An illuminance meter measures and quantifies the brightness of a lighted area, measuring the luminous flux per unit area (lm: lumens). The illuminance meter's sensitivity to light wavelengths matches the sensitivity of the human eye, and it obeys the cosine law for light emitted at an angle. The cosine law is a law that states that the luminous intensity Iθ from an evenly diffused area to a certain direction is proportional to the cosine of the angle θ formed with the luminous intensity in the direction normal to this area. This can be expressed in terms of a conductor as follows.
Iθ = In cosθ
The light-receiving part of the illuminance meter consists of a photodiode that converts light into an electrical signal, an optical filter to match the sensitivity of the human eye, and a diffusing globe to follow the cosine law.
Regarding the sensitivity of the human eye, with a peak at 555 nm, the sensitivity of 380 to 780 nm, with a mountain-shaped wavelength selection in the region of 380 to 780 nm.
Therefore, illuminance (lux) itself is also detected within this range.
The illuminance meter is very easy to use. Just press the measurement button on the illuminance meter, and the measured value will be displayed. Most illuminance meters are large enough to be easily carried by hand and can be easily used in a variety of situations. However, depending on how you use the meter, you may not get the correct measured value.
The following are points to be considered when using these instruments.
Illuminance meters are affected not only by direct incident light from the light source but also by reflected light. Since the illuminance meter can be affected by reflected light from the hand, face, and clothing of the person being measured, it is necessary to take measures such as bending down as much as possible and wearing clothing with low reflectance.
When the light source of a filter-type illuminance meter is a narrow beam of light, the path of light reaching the light-receiving element varies depending on the angle, which affects the measured value. When measuring a spotlight that is smaller than the illuminance receiving area of the illuminance meter, care should be taken to consider a different measurement method.
In filter-type illuminance meters, the closer the distance between the light source and the illuminance meter is, the more the light incident on the illuminance meter is angled, resulting in an error. Normally, a distance of about 1 m or more from the light source to the illuminance meter is sufficient to avoid problems.
In addition, standards and measurement methods are established when checking for a safe and comfortable environment in schools, workplaces, factories, and other places. It is necessary to understand the purpose of use and measurement conditions of the measuring instruments and to use them correctly.
Various types of illuminance meters are based on measurement range, accuracy, and ease of use.
Analog illuminance meters are used to simply check the light intensity of fluorescent lamps and the like. They are also used when you want to fix them to a specific location and measure them periodically.
Digital illuminance meters have a wide measurement range and are useful for measuring various locations, such as indoors and outdoors. There are types with separate light-receiving and display sections, which are useful when the measurement locations are far apart. They can be used for a wide range of applications.
As for the measurement range, the range that can be measured differs from illuminance meter to illuminance meter, but some types can switch the specific range in stages.
*Including some distributors, etc.
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Agiltron Inc., founded in 2001 and headquartered in Woburn, Massachusetts, is a manufacturer and developer of premium optical and photonic components and systems for communications, sensing, and instrumentation. The company is an ISO 9001 certified optical systems producer with a team of scientists and engineers, and well-equipped modern facilities. It serves markets with both standard products and customer-driven special product development. Its products are based on optical, micromechanical, and electro-optic systems, in combination with its competencies in manufacturing, imaging systems, and infrared photonics.
TOPCON TECHNOHOUSE CORPORATION, a company established on October 8, 1982, and headquartered in Tokyo, Japan, is a manufacturer and supplier of measurement apparatus. The company offers products and advanced technologies such as positioning systems, imaging devices, laser scanners, and software solutions that enable accurate measurement, mapping, and visualization of data. These Products and services are utilized in various industries, including construction, agriculture, healthcare, and geospatial applications. Their products are used for tasks such as land surveying, construction site monitoring, precision agriculture, and medical imaging.
Established in 2006, Testo India Pvt. Ltd., a Pune, India-based subsidiary of Testo SE & Co. KGaA, is a manufacturer and supplier specializing in measuring instruments. Complying with the ISO/IEC 17025:2017 standard set by the National Accreditation Board for Testing and Calibration Laboratories (NABL), the company produces measuring instruments for temperature, humidity, pressure, and flow (bulk fluid movement). The company also offers electrical, sound level, and nanoparticle measuring devices. These products are designed for industrial applications with regard to heating, ventilation, air conditioning, and refrigeration (HVAC-R), as well as environmental monitoring technology, in sectors like food service, retail, and pharmaceuticals.
Line Seiki, a manufacturer of counters and test measuring instruments based in Tokyo, Japan, was founded in 1949. The company offers products such as limit switches, rotary encoders, tachometers, electronic counters, and measuring devices. The firm runs a solutions division where it provides length, counting, control, and IOT measures. The goods are included in pumps, billiard tables, roller shutters, copy machines, and vending machines. The business runs a design, development, and manufacturing-integrated production process for the products.
Promax Test & Measurement SLU, founded in 1963 and based in Barcelona, Spain, is a manufacturer of telecommunication instrumentation and electronics equipment. The ISO 9001-certified company stocks products like digital modulators for broadcast, earth resistance meters, and optical fiber fusion splicers used to provide testing solutions for satellite, cable, and digital terrestrial television. It stocks over 200 products at its Barcelona facility, with 18 calibration centers and several service centers worldwide. It produces on-demand PCB circuit boards and electronic equipment and offers software development, training, and industrial design services.
Shenzhen Linshang Technology Co., Ltd., established in 2008 and headquartered in Shenzhen, China, is a manufacturer of measuring instruments. It specializes in five main categories of instruments, including solar film measurement, optical transmittance, ultraviolet measurement, gloss and coating thickness measurement, and thickness and hardness measurement. Some of its products include Solar Film Transmission Meters, Spectrum Transmission Meters, UV Energy Meters, Gloss meters, and Portable colorimeter. The company offers its products online, available through Aliexpress or Alibaba.
UNI-TREND TECHNOLOGY CO., LTD. was established in 1988 and is a manufacturers of measuring and imaging devices based in Dongguan, Guangdong, China. The company produces various products such as digital multimeters, electrical power testers, DC electronic loads, handheld thermal cameras, and thermal imaging monoculars. The products are used in various applications such as industry electricity, environment monitoring, communication, photovoltaic power station, and ranging and mapping. The company has obtained ISO 9001 and ISO 14001 certifications.
T&D Corporation, headquartered in Matsumoto, Japan, has been a manufacturer of data loggers that provide accessible data since 1986. They offer a wide range of products that enable monitoring and recording of environmental parameters. Their product lineup includes temperature loggers, humidity loggers, voltage loggers, current loggers, and pressure loggers. These provide valuable data for analysis and decision-making in diverse applications such as food storage, pharmaceuticals, environmental monitoring, and energy management. T&D Corporation also offers software and apps to complement their data loggers for data management, visualization, and remote access.
Chauvin Arnoux began in 1893 in France and took off in 1905 with the invention of the magneto ohmmeter. Chauvin Arnoux is an integrated manufacturer of portable test and measurement instruments used in the electrical sector, education, laboratories, and maintenance. A sample of Chauvin Arnoux’s products include calibrators, electrochemical measurements, relays, analystical software, and accessories. Chauvin Arnoux also offers industrial subcontracting, leveraging its large network of independently operating yet functionally integrated subcontractors’ abilities to manufacture and install PCBs, specialty items, sheet metal, tooling, and more.
Delta OHM S.r.l., established in 1978 and based in Caselle di Selvazzano, Italy, is a manufacturer and supplier specializing in meteorological devices. The company's product portfolio includes ultrasonic anemometers, particulate matter transmitters, barometric pressure transmitters, thermometers, and other devices. These devices are utilized in various industries, including environmental monitoring, meteorology, renewable energy, agriculture and food, as well as health and safety. The company holds both ISO 9001:2015 and ISO 14001 certificates, and it employs more than 330 individuals across sixteen global locations.
PCE Instruments UK Ltd., started in 199 and headquartered in Manchester, UK, is a manufacturer and supplier of test instruments, equipment, and tools for weighing, measuring, and control systems. The company offers more than 500 test equipment, including analyzers, inspection cameras, meters, detectors, and sensors, with applications in various fields like data acquisition, electrical engineering, environmental science, building inspection, and food processing. Its manufacturing and development division is ISO 9001 certified, all its test instruments, equipment, and tools are factory calibrated, and the company also provides services for custom test instrument design, installation, and maintenance.
Hioki E.E. Corporation was founded in 1935 and headquartered in Ueda, Nagano. Hioki provides testing & analysis, manufacturing & inspection, and equipment maintenance to industries including mobility, battery, motor, energy, electronic components, and infrastructure. Hioki’s has 10 primary product categories which are: recorders and data loggers including oscilloscopes, LCR/Resistance Meters, safety testing including signal generators and calibrators, power meters including power quality analyzers, probes & sensors, optical & PV maintenance & telecommunication, environmental measuring, DMM & testers & field measuring, IoT & new solutions & meter relay, and bare board & package testing.
Ranking as of April 2026
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | Testo SE & Co. KGaA |
15.6%
|
| 2 | PROMAX Test & Measurement SLU |
13.3%
|
| 3 | TechnoOptis Co., Ltd. |
11.1%
|
| 4 | Agiltron Inc. |
8.9%
|
| 5 | Line Seiki Co.,Ltd. |
6.7%
|
| 6 | T&D |
6.7%
|
| 7 | Delta OHM S.r.l. |
6.7%
|
| 8 | HIOKI E.E. CORPORATION |
6.7%
|
| 9 | Chauvin Arnoux Metrix |
6.7%
|
| 10 | Konica Minolta Japan Co., Ltd. |
6.7%
|
Derivation Method
The ranking is calculated based on the click share within the illuminometer page as of April 2026. 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 (%) |
|---|---|---|
|
Japan
|
5 | 50.0% |
|
United States of America
|
1 | 10.0% |
|
Germany
|
1 | 10.0% |
|
Spain
|
1 | 10.0% |
|
Italy
|
1 | 10.0% |
|
United Kingdom
|
1 | 10.0% |
110 products found - Page 2
110 products - Page 2
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