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As well as spectroradiometers with integrated displays, Gigahertz-Optik manufactures spectroradiometer sensors that are separated from the operator’s handheld controller. These are more suitable for applications that require the sensor to be incorporated within some measurement system or equipment.  In some situations the influence of the operator on the measured value can be reduced by the greater distance to the sensor.

Sensor with fully integrated spectroradiometer function


The CSS-45 is a complete spectroradiometer in a compact metal housing. With its cosine-corrected field of view, the sensor is suitable for measuring the absolute spectral irradiance without requiring any additional accessories. The sensor calculates a comprehensive range of measurement quantities from the measured spectral data. The high-quality diffuser offers a cosine-adjusted field of view with an f2 error of ≤ 1.5 %. The sensor is therefore qualified for measuring extended light sources and large area lighting devices.

Compact control unit

Since measurement data is processed directly in the CSS-45 sensor, the CSS-D unit is used exclusively for controlling the sensor and displaying the measured values. For this purpose, it is connected to the sensor by means of a 2 m long flexible cable. The CSS-D is equipped with a high capacity rechargeable lithium battery which also powers the sensor. The battery can be charged with common USB chargers. The color touch-screen offers a good contrast display.

Alternatively, the CSS-D can be attached to a PC by a USB cable. This enables remote-control of the device.

Universal hand-held spectroradiometer

The instrument measures from 360 nm to 830 nm, thereby supporting the CIE spectral range for photometric measurements (ISO/CIE 19476). The spectral bandwidth is 10 nm which, in combination with the mathematical bandwidth correction according to CIE 214, provides a sufficiently high spectral resolution for most photometric and colorimetric applications. The illuminance measurement range is 1 lx to 350.000 lx, exceeding the performance of many other products. An absolute must-have for any array spectroradiometer is the ability to perform a dark current measurement for accuracy and to compensate for temperature influences. The CSS-45 sensor incorporates an electromechanical shutter for this purpose, which performs fully automatic dark current measurements when the operating temperature changes. The meter displays comprehensive radiometric, photometric and colorimetric quantities, all of which are derived from the measured spectrum.
Many additional measurands expand the supported applications of the handheld spectroradiometer. They are described on the product page of sensor CSS-45.

Calibration and adjustment

With its individual wavelength and linearity correction, the meter provides a cost effective solution for high precision light measurements, irrespective of the intensity or spectral distribution of the source.
A key quality feature of Gigahertz-Optik’s light meters is their precise and traceable calibration. The calibration laboratory of Gigahertz-Optik GmbH guarantees the high quality and traceability of their factory calibrations. The calibration of the CSS-45 with CSS-D is confirmed by a factory calibration certificate.

Handheld instrumenmt CSS-45 with CSS-D

CSS-45 sensor is used in an application separated from the control unit CSS-D.

Display screenshot.
Short description

Handheld instrument for illuminance, color, irradiance (360 nm - 830 nm), PAR and bilirubin.

Main features

Compact and robust sensor with splashproof housing and universal mounting options. Sensor separated from control unit for easier integration into measurement setups. Direct output of radiometric, photometric, colorimetric and specialist functions. Precision cosine diffuser. Remote controlled dark level shutter. Application software.

Measurement range

1 lx to 350,000 lx (for white LED), 360 nm to 830 nm.

typical applications

Compact and precise illuminance handheld measurement device for lighting applications (i. a. architecture, museum illumination) as well as for laboratory applications.


Factory calibration. Traceable to international calibration standards.


see specifications of sensor: CSS-45


Sensor: 130 g, only sensor without cable

Display unit: 160 g

temperature range

Operation: 10°C bis +30°C

Storage: -10°C bis +50°C

Power Supply

rechargeable battery

minimum 8h of operation

Type Description File-Type Download
Datasheet CSS-45 with CSS-D PDF
technical drawing CSS-45 PDF
CSS-45 with CSS-D Technical Datasheet CSS--45 with CSS-D brochure PDF
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15308867 CSS-45

Measurement device, USB cable, software, calibration, calibration certificate.

15308950 CSS-45-WT

Splash-proof measurement device, USB cable, software, calibration certificate.

15309361 CSS-D

Control unit for CSS-45. Connector cable.

15310446 KP-CSS45-E-S

Option: DIN EN ISO/IEC 17025:2018 Test Certificate (DAkkS)

Spectral irradiance measurement in wavelength range from 360nm to 830nm.

15308903 K-CSS45-E

Re-calibration of a CSS-45's spectral irradiance including wavelength adjustment. Calibration certificate.

15309228 K-CSS45-WT-E

Re-calibration of a CSS-45-WT's spectral irradiance including wavelength adjustment. Calibration certificate.

15311529 KKP-CSS45-E-S

Factory Calibration Certificate with DIN EN ISO/IEC 17025:2018 Test Certificate.

15306347 S-SDK-MSC15

Software Development Kit for software implementation of the CSS-45 into custom software.

15308887 BHO-24

Carry case for CSS-45 and accessories.

15309091 CSS-45-Z01

RS-485 interface connector for CSS-45.

15309559 CSS-45-Z02

25 m long RS485 cable for CSS-45.

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