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Types of 3NH Geometric Test Charts Products

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FAQs About  Geometric Test Charts

Measurement Accuracy (dE/ΔE): The smaller the value, the higher the match between the color measured by the colorimeter instrument and human visual perception. Generally, dE < 1.0 is regarded as the industrial passing line, while dE < 0.5 falls into the high-precision level. 

Measurement Structure: D/8 (integrating sphere structure) is the universal standard, which includes two modes: SCI (Specular Component Included, with specular reflection light) and SCE (Specular Component Excluded, excluding specular reflection light). 45/0 (ring illumination) simulates the human eye's viewing angle and is more suitable for judging reflective materials. 

Repeatability: It refers to the difference in color results when measuring the same point multiple times. The equipment can achieve ΔE < 0.08, ensuring highly reliable measurement results. 

Illumination Source and Viewing Angle: It is recommended to choose the combination of CIE standard light source D65 (simulating daylight) and a 10° viewing angle. 

Application Scenario Requirements: It is necessary to clarify the purchase purpose (quality inspection? R&D? material evaluation?) and the usage environment (laboratory, workshop or field work?).


ΔE*ab ≤ 0.1: For general quality control in textiles, printing, plastics, etc.Recommended models: NH310, NR60CP, NR110, ColorReader series

ΔE*ab ≤ 0.03: For medium-precision applications such as automotive interiors and electronic housings.Recommended models: CR8, CR9, PS2080, PS2070 series

ΔE*ab ≤ 0.02: For high-precision applications such as coatings and dyeing.Recommended models: ST7700, ST70, ST60, PS2080, YS6060, MS30 series

ΔE*ab ≤ 0.01: For laboratory-grade precision measurement.Recommended models: TS8520, TS8560, TS8500, TS4020 series


 A gloss test gauges the reflective quality of a surface by casting light at a fixed angle and measuring the amount reflected. It defines the level of shine or dullness of a surface, and it is very crucial in coatings, automotive, and product finishing


A visual colorimeter is a type of colorimeter that uses the human eye to compare the color depth of a sample with that of a standard solution for semi-quantitative or quantitative analysis of substances. This method is commonly used for quick, rough evaluations in industries such as petroleum, transparent liquids, varnishes, chemicals and printing, as well as for visual color grading in quality control. Its working principle is to compare the sample with a standard and provide visual color measurement results, rather than relying on electronic sensors.

Visual Colorimeters vs. Photoelectric Colorimeters

Visual colorimeters rely on human eye observation, whereas photoelectric colorimeters use sensors to deliver higher precision, complete the measurement automatically through electronic circuits, less subjective color measurement and faster results. They are generally more suitable for rapid, on-line or portable color difference measurement.

Working principle of a photoelectric colorimeter

A light source emits light at specific wavelengths, which interacts with the object surface through reflection and transmission. The light is reflected or absorbed by the sample, and the reflected light or remaining transmitted light is received by a photoelectric sensor (photocell or photodiode). The instrument converts the light intensity signal into an electrical signal, thereby measuring the LAB color values of the sample.

3nh Photoelectric Colorimeter – A Trusted Brand in the Color Measurement Industry

Featuring ultra-high precision, user-friendly interface, light positioning function, high-capacity lithium-ion battery, and multiple optional measurement angles.



Of course! Many portable, battery operated, and lightweight coating thickness gauges are available for on-site and field inspections. They provide quick and accurate results and portable gauges are ideal for construction, automotive, and industrial environments.


The ΔE (Delta E) formula of the CIELAB color space is usually used to measure color difference. The difference is measured in a colorimeter or spectrophotometer to gauge the level of perceptibility of the difference between two samples in terms of L*a*b*.


Further Geometric Test Charts Applications and Solutions

Textile Dyeing Recipe Solution
Wood Veneer Color Matching
Advanced Color Management in the Textile Industry
Glass, Film Transparent and Semi Transparent Materials Measurement
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