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GBPI Spectrophotometer (Core Technology)

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Product Detail

Spectrophotometer ST50 is a spectrophotometer developed by GBPI series core technology, using built-in photodiode array (double 20 groups) sensors, imported whiteboard, while taking into account the measurement speed and convenience of operation. The repeatability delta E* AB of ST50 spectrophotometer is easily controlled within 0.03, and the Inter-instrument error delta E* AB is controlled within 0.2, to make the measurement more accurate. And the test data can be used for accurate color analysis and transmission in the laboratory.


Spectrophotometer ST50 is equipped with one customized measuring aperture, accurate color measurement and stable performance. It is used for accurate color measurement and quality control in plastic electronics, paint ink, textile and garment printing and dyeing, printing, ceramics and other industries, and can be used for fluorescent sample measurement.



1. Large area photodiode array (dual 20 arrays) sensor 

A larger area of double 20 array sensor, strong light saturation, weak light sensitivity and a wider spectrum response range, to ensure the instrument measurement speed, accuracy, stability and consistency, independent core technology, and international standards of the same platform, to achieve complete compatibility.

1. Adopt D/8 structure and SCI/SCE mode 

Spectrophotometer ST50 uses a widely international use D/8 optical structure, SCI/SCE (Specular Component Included/Specular Component Excluded) synthesis technology, support SCI+SCE at the same time fast measurement, test time about 1.5 seconds. 

2. Combination of full spectrum LED light source and UV light source

The use of 400-700nm full spectrum LED light source ensures sufficient spectral distribution in the visible light range, avoiding the spectral loss of specific bands, strong light will not be saturated, weak light is more sensitive, and fluorescence samples can be easily measured.

4. Camera positioning can clearly observe the measured area 

The ST50 spectrophotometer has built-in camera. Through the real-time scene-taking of the camera, it can accurately determine whether the measured part of the object is the target center, which improves the measurement efficiency and accuracy.

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Product Features

1.Perfect combination of the beautiful appearance and the ergonomic structure design;

2.Combined LED light sources with long life and low power consumption, including UV light;

3.Switchable apertures: Φ2/4/8mm, adapt to more samples;

4. Accurately measure reflectance spectrum, CMYK density and Lab value of the sample;

5.High-configuration electronic hardware: 3.5-inch TFT true-color screen, capacitive touch screen, concave grating, 256-pixel dual-array CMOS image sensor, etc.;

6.Two standard observer angles: 2/10, multiple light source modes and color systems;

7.USB mode is widely used.

8.Large-capacity storage space, over 10,000 test data;

9.Especially suitable for process control and quality control of printing plants;

10. PC software has powerful function expansion.






Measurement Geometry

45/0(45 ring-shaped illumination, 0 degree viewing angle); ISO 5-4,CIE No.15


Common spectrophotometer densitometer, apply in ink printing, in Film Processing, Textile Printing and Dyeing, Plastic Electronics and Other Industries for Color Measurement and Quality Control;especially suitable for the measurement and quality control of optical density and dot enlargement in ink printing;able to customize single aperture Φ2mm,Φ4mm,Φ8mm.

Light Source

Combined LED Light, UV Light

Spectral separation device

Concave Grating


256 Image Element Double Array CMOS Image Sensor

Wavelength Range


Wavelength Pitch


Half Bandwidth


Measurement Conditions

Compliance with ISO 13655 measurement conditions;
M0 (CIE Light Source A)
M1 (CIE Light Source D50)
M2 (Excluding UV light source)
M3 (M2+Polarized light filter)

Density Standards

ISO Status A, E, I, T

Density index

Density value, density difference, dot area, dot enlargement, overprint, printing characteristics, printing contrast, tone error and gray level

Measurement aperture

Customized one apertureΦ2mm,Φ4mm,Φ8mm optional

Color Spaces


Color Difference Formula


Other Colorimetric Index


Observer Angle




Measurement Time

About 1.5s


Density: Within 0.01 D


Chromaticity value:within ΔE*ab 0.04 ( When a white calibration plate is measured 30 times at 5 second intervals after white calibration) Except M3

Inter-instrument Error

Within ΔE*ab 0.2 (Average for 12 BCRA Series II color tiles) Except M3

Measurement mode

Single Measurement, Average Measurement(2-99)




About 600g

Power source

Li-ion battery. 5000 measurements within 8 hours

Illuminant Life Span

5 years, more than 3 million times measurements


3.5-inch TFT color LCD, Capacitive Touch Screen



Data memory

10000 pcs


Simplified Chinese, English, Traditional Chinese

Working Environment

Temperature: 0~40℃; Humidity: 0~85% (No Condensation);altitude: less than 2000 m

Storage Environment

Temperature: -20~50℃; Humidity: 0~85% (No Condensation)

Standard Accessory

Power Adapter, USB Cable, Built-in li-ion battery, User Manual, software(download from the website),White and Black Calibration Board, Protective Cover,Polarization filter box,Locating Plate

Optional Accessory

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