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PS301 Sectrophotometer

PS301 Sectrophotometer Instructions Operating Manual PS301 Sectrophotometer PDF
This PS301 Sectrophotometer Instrument are Certified with
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1 Years Warranty (Additional support period of 3 years)

The 3nh PS301 spectrophotometer is a high-precision colorimeter specially designed for micro-aperture precision measurement and automated production line integration. It utilizes a 1mm micro-aperture diameter, enabling accurate color measurement of extremely small areas and minute color blocks. The instrument integrates multiple electronic color charts, allowing for rapid matching from physical samples to industry-standard color chart numbers, thus improving color matching and quality inspection efficiency.

The PS301 spectrophotometer features a dual-purpose design, supporting both unit and probe measurements, or probe-only measurements, flexibly adapting to both manual and automated scenarios. It employs a dual-channel silicon photodiode array sensor and nano-integrated spectral devices , ensuring fast and stable measurements. Supporting RS485/USB communication and multi-unit collaboration , and with accompanying software, it can be integrated into production lines and robotic arms, providing real-time color data monitoring and synchronous data transmission, offering efficient quality control solutions for various industries.

I. Precise Measurement: Micro-orifice Design, Authoritative Data

1. Equipped with a 1mm ultra-small aperture :Designed specifically for color difference detection of extremely small objects, tiny areas, narrow edges, and miniature samples, accurately capturing detailed color information.

2. High-precision spectroscopic technology: Adopting nano-spectroscopy technology and dual-channel silicon photodiode array (18 groups in two columns), the repeatability ΔE*ab≤0.03 and the inter-station difference ΔE*ab≤0.4 ensure the repeatability and consistency of measurement data.

3. International standard optical structure :D/8 SCI illumination method, conforming to multiple international standards such as CIE, ISO, ASTM, and DIN.

4. Authoritative metrological certification : The factory guarantees metrological compliance, and the data is traceable.

I. Precise Measurement: Micro-orifice Design, Authoritative Data


II. Strong Industrial Integration: Quality Control of Automated Production Lines

1. Dual-purpose and flexible deployment:The whole machine is suitable for manual measurement, while the probe mode can be independently connected to automated equipment to realize online color measurement on the production line.

2. RS485 / USB Communication: Supports multiple industrial communication protocols, and comes standard with an RS485 adapter for easy multi-device networking and collaboration.

3. Upper computer software support :Provides professional quality management software that supports real-time data transmission, storage, and analysis, facilitating traceability and report generation.

Strong Industrial Integration


III. Easy to use: Intelligent interaction, quick and easy to learn

1. Intuitive interface : 3.5-inch TFT true color capacitive touch screen, simple to operate, no complicated training required.

2. Contact whiteboard calibration + auxiliary positioning lines :Simplify calibration and positioning processes and reduce human error.

3. Multi-system compatibility : Supports Android, iOS, Windows, HarmonyOS, and WeChat Mini Programs, enabling cross-device data synchronization.

Easy to use


IV. Wide measurement range: adaptable to complex scenarios in multiple industries

1. Advantages of micro-orifice measurement: The 1mm micro-orifice diameter is suitable for color difference quality control and automated quality control of extremely small parts in industries such as plastics and electronics, paints and inks, textiles and clothing printing and dyeing, printing, and ceramics.

2. Multiple Colorimetric Indicators: Supports spectral reflectance, whiteness/yellowness (multiple standards), metamerism index (MI), and color density (CMYK) to meet the professional needs of industries such as printing, textiles, and plastics.

3. Multiple color spaces and observation light sources: Supports color spaces such as CIE LAB, XYZ, LCh, and s-RGB, as well as multiple observation light sources such as D65, A, and D50, adapting to different industry standards.

Wide measurement range


V. Strong Application Expansion: Automated Collaboration + Data Management

1. Multi-device collaboration: Supports simultaneous access of multiple devices, unified control and data aggregation, and adapts to multi-point detection in pipelines.

2. Data Synchronization and Traceability: The host computer software supports data storage, comparative analysis, and report export, facilitating quality traceability and process optimization.

3. Flexible integration: Provides standard communication interfaces such as USB, RS485, RS232, and Ethernet, supports external expansion and secondary development, and is easy to integrate into robotic arms to adapt to industrial systems.

Strong Application Expansion


VI. Intelligent Matching: Built-in electronic color card for quick search of standard color codes.

1. Built-in multiple color cards: The instrument integrates multiple industry-standard electronic color cards, eliminating the need to consult physical color card books.

2. Rapid matching of physical objects : After measuring the color of the physical object, the instrument automatically matches the closest standard color card number, quickly completing color matching and confirmation.

3. Improve work efficiency :Applicable to scenarios such as color matching, incoming material inspection, and color number confirmation, reducing manual comparison errors and accelerating the workflow.

Intelligent Matching


Product Model PS301 Spectrophotometer
Lighting method D/8 (diffuse illumination, 8° direction reception), SCI (including specular reflection), conforming to standards CIE No. 15, GB/T 3978, GB 2893, GB/T 18833, ISO 7724-1, ASTM E1164, DIN 5033 Teil 7
Characteristic Employing a dual-channel silicon photodiode array sensor with a built-in electronic color card, it is used for color difference quality control in industries such as plastics and electronics, paints and inks, textiles and apparel printing and dyeing, printing, and ceramics.
Lighting source Combined full-spectrum LED light source
Integrating sphere size Φ20mm
Spectrophotometry Nanoscale integrated spectral devices
Sensors Silicon photodiode array (dual-row, 18 groups)
Measurement wavelength range 400-700nm
Wavelength spacing 10nm
Measuring Diameter 1mm
Light-containing methods SCI
Color space CIE LAB,XYZ,Yxy,LCh,CIE LUV,s-RGB
Color difference formula ΔE*ab
Other colorimetric indicators Spectral reflectance, WI (ASTM E313, CIE/ISO, ISO2470/R457, AATCC, Hunter, Taube, Berger, Stensby), YI (ASTM D1925, ASTM 313), metamerism index MI, color density CMYK
Observer's perspective 2°/10°
Observation light source D65,A,D50
show /
Measurement time Approximately 1 second
Repeatability Chromaticity value: Standard deviation ΔE*ab within 0.03 (average value of 30 measurements on a white board at 5-second intervals after preheating and correction). Spectrophotometric reflectance: MAV/SCI, standard deviation within 0.1% (400~700nm: within 0.2%).
Inter-platform difference ΔE*ab within 0.4 (average value measured from 12 color swatches of BCRA Series II)
Display accuracy 0.01
Reflectivity measurement range 0-200%
Reflectivity resolution 0.01%
Measurement method Single measurement, average measurement (2~99 times)
Positioning method Auxiliary positioning lines
Whiteboard verification method Contact Whiteboard Verification
size Main unit: 80*132*20; Probe: φ43*73.5
weight Main unit: 250g; Probe (including calibration box): 240g
Battery power Lithium battery, 3.7V, 3200mAh, 15,000 cycles in 9 hours.
Lifespan of lighting sources More than 3 million measurements in 10 years
Display screen 3.5-inch TFT true color capacitive touchscreen
interface USB, Bluetooth, RS485 (probe)
Store data 500 standard samples, 10,000 test samples, massive storage via APP/PC
Software support Android, iOS, Windows, WeChat Mini Programs, HarmonyOS
language Simplified Chinese, English, Traditional Chinese, Russian
Operating temperature range 0~40℃, 0~85%RH (non-condensing), altitude: below 2000m
Storage temperature range -20~50℃, 0~85%RH (non-condensing)
Accuracy Guarantee Ensure measurement compliance
Standard Annex Power adapter, data cable, instruction manual, quality management software (downloadable from the official website), white calibration box, positioning plate, Bluetooth adapter, RS485 adapter
Optional accessories Mini printer
Note: Subject to change without notice.



Our Valued Clients

  • Client mankind
  • customer century laminate
  • partner axa
  • customer bell logo
  • 3nh customer bridgestone
  • 3NH customer atlas
  • 3nh customer cadbury
  • studds logo

FAQs About  Portable Spectrophotometers

A benchtop spectrophotometer is not universally better—it outperforms portable units in precision and lab testing, while portable models win for on-site flexibility. Which one is better depends entirely on your testing scenarios, accuracy requirements and workflow.


Benchtop Spectrophotometer Advantages

  • Higher measurement accuracy & repeatability, excellent inter-instrument agreement

  • Supports full-spectrum analysis, more geometric optical designs

  • Larger testing aperture, compatible with curved, textured and bulk samples

  • Ideal for laboratory QC, R&D, formula matching and standard color calibration

  • Stable performance, less affected by external light and environment


Portable Spectrophotometer Advantages

  • Compact, lightweight, test anywhere anytime (production line, warehouse, on-site inspection)

  • Fast one-click measurement, no fixed power and lab space required

  • Perfect for incoming material inspection, on-line production spot check, field color comparison

  • Lower cost and easier to operate for frontline workers


Which One Should You Choose?


Choose benchtop if you need:

Lab R&D, high-precision color grading, standard sample database establishment, strict quality control for cosmetics, plastics, textiles and food.


Choose portable if you need:

On-site rapid detection, production line mobile sampling, outdoor and on-location color measurement.


The main instruments used to detect color are spectrophotometers and colorimeters (including photoelectric integrating colorimeters). 

Spectrophotometer: High-precision option. It analyzes the full visible light spectrum to measure color accurately. Suitable for complex scenarios like textured surfaces, special effect colors, or batch consistency checks in industries such as paint and coatings. 

Colorimeter (Photoelectric Integrating Colorimeter): Cost-effective and portable. It uses RGB filters to measure tristimulus values directly. Ideal for quick color difference detection in simple applications. Key Selection Tip Choose based on accuracy needs: use a spectrophotometer for high-precision color measurement, and a colorimeter for fast, basic color difference checks.


Yes, we can offer Spectrodensitometer quality certification issued by our lab free of charge, or issued by third-party international inspection Organizations with extra charge, please contact us for confirmation.

Who are we? Threenh Technology: 22-Year Professional Color Measurement Solution Provider

Threenh Technology is a Chinese professional Measurement Instrument manufacturer with 22 years of industry experience, specializing in the field of color measurement and surface gloss detection. Integrating research and development, design, production, marketing, and sales, the company takes technological innovation as its core and is committed to providing global customers with high-precision and intelligent testing instruments as well as professional solutions.


A colorimeter is sufficient for basic, routine color checks, while a spectrophotometer is needed for precise, comprehensive color analysis—here’s the clear breakdown:

When a Colorimeter is Sufficient

  1. Simple color matching needs: Ideal for checking if a sample matches a predefined standard (e.g., basic paint batches, plastic parts with solid colors).

  2. Consistent lighting conditions: Works well when measurements are done under fixed, standard light sources (no need to account for varied light effects).

  3. Cost-sensitive, high-volume tasks: Perfect for production lines requiring fast, low-cost color checks without advanced data analysis.

When to Use a Spectrophotometer

  1. Precise color quantification: Necessary for measuring Lab values (lightness, red-green, yellow-blue axes) or detecting subtle color deviations (critical for automotive coatings, high-end textiles).

  2. Complex color analysis: Required for metallic/pearlescent finishes, transparent materials, or samples with gloss/texture variations.

  3. Compliance and documentation: Essential when precise color data (spectral curves) is needed for quality audits, regulatory compliance, or brand color standardization.


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