3nh NR145+ Handheld Color Difference Meter (45°/0° Geometry)

Overview

The 3nh NR145+ is a precision handheld color difference meter engineered for consistent, traceable color evaluation in industrial quality control environments. It employs the CIE-compliant 45°/0° illumination/reception geometry—where light is directed onto the sample at 45° from the normal axis and reflected light is collected at 0° (perpendicular to the surface). This optical configuration closely emulates human visual assessment under standardized lighting conditions, minimizing specular influence and delivering measurement results with high visual correlation. Designed for routine pass/fail verification and inter-instrument comparability, the NR145+ integrates full-spectrum LED illumination (400–700 nm), dual-CMOS optical path detection, and dynamic integration timing to ensure stable spectral response across diverse surface textures and gloss levels. Its compact form factor (205 × 67 × 80 mm), ergonomic hand-held architecture, and integrated lithium-polymer battery (3.7 V / 3200 mAh) support extended field deployment without consumable battery replacement.

Key Features

• 45°/0° optical geometry compliant with CIE Publication No. 15 and GB/T 3978, optimized for non-specular color measurement of flat and textured surfaces
• Full-spectrum LED illumination with spectral output spanning 400–700 nm, enabling accurate tristimulus value computation per CIE 1931 10° standard observer
• Dual-CMOS sensor architecture with super-optical-path design, enhancing signal-to-noise ratio and reducing drift during sequential measurements
• Φ8 mm measurement aperture with dual-positioning system: illuminated crosshair targeting + mechanical contact ring for repeatable placement and pressure consistency
• Pre-stored white calibration reference eliminates daily recalibration; instrument achieves operational readiness within seconds after power-on
• TFT true-color 2.8-inch display (16:9 aspect ratio) with intuitive icon-based UI supporting real-time L*a*b*, L*C*h*, ΔE*ab, and pass/fail status visualization
• Built-in data storage for up to 100 standard references and 20,000 sample records; USB interface enables direct transfer to host PC
• Compliant with ISO 9001-certified manufacturing processes; certified to CE, TÜV, and SCM metrological standards for industrial use

Sample Compatibility & Compliance

The NR145+ accommodates opaque, semi-opaque, and matte-finished materials including plastics, painted metal, coated paper, textiles, ceramics, and powder-coated substrates. Its 45°/0° geometry inherently suppresses directional reflectance artifacts, making it suitable for samples with moderate surface gloss (up to 70 GU). The instrument meets geometric requirements specified in ASTM D2244 (Standard Practice for Calculation of Color Differences), ISO 11664-4 (CIE colorimetry – Part 4: CIE 1976 L*a*b* colour space), and GB/T 2409 (Plastics – Determination of color difference). While not designed for wet-film or highly transparent media, its robust mechanical end-face and stable contact pressure ensure reproducible readings across batch production lines operating under ambient temperatures from 0°C to 40°C.

Software & Data Management

The included Quality Management Software (QMS), downloadable from the official 3nh website, supports comprehensive data analysis, statistical process control (SPC), and report generation in PDF/CSV formats. It provides audit-trail-capable session logging, user-defined tolerance bands per standard, and comparative delta-E trend charts across multiple instruments. Although the NR145+ does not natively support FDA 21 CFR Part 11 electronic signature functionality, QMS export logs include timestamps, operator IDs, and measurement metadata required for GLP/GMP-aligned documentation workflows. All firmware updates and software patches are distributed through verified channels and validated against ISO/IEC 17025 traceability principles.

Applications

• Paint & coatings QC: Batch-to-batch color consistency verification against master standards in automotive refinish and architectural coating lines
• Plastics manufacturing: In-line color matching of injection-molded parts, extruded profiles, and film products
• Printing & packaging: Spot-checking CMYK spot colors and substrate tint uniformity prior to press run approval
• Textile dyeing: Monitoring shade variation across dye lots under D65 illuminant simulation
• Electronics assembly: Verifying anodized aluminum housing color compliance in consumer device production
• Educational labs: Teaching foundational colorimetry concepts including CIELAB space, metamerism, and observer angle effects

FAQ

What does “45°/0° geometry” mean, and why is it preferred for industrial color measurement?
It denotes illumination at 45° relative to the sample normal and collection at 0° (normal incidence), minimizing specular reflection interference and aligning closely with visual perception under controlled lighting—making it ideal for comparing manufactured parts against physical standards.
Is the NR145+ suitable for measuring curved or irregular surfaces?
It is primarily designed for flat or gently curved surfaces with stable contact; concave or highly contoured geometries may require accessory fixtures to maintain consistent aperture alignment and pressure.
How often must the instrument be calibrated, and what reference is used?
Factory-calibrated using NIST-traceable ceramic white tiles; users perform zero calibration via built-in dark current compensation and verify against the supplied white calibration plate before each shift.
Can measurement data be exported for SPC analysis in third-party statistical software?
Yes—CSV exports contain full L*a*b*, ΔE*ab, date/time stamps, and sample ID fields compatible with Minitab, JMP, and Excel-based control charting tools.
Does the NR145+ support multiple color spaces beyond CIELAB?
It computes and displays CIE XYZ, CIELAB (L*a*b*), and CIELCH (L*C*h*) values simultaneously; additional spaces such as CMC(l:c) or ΔE00 require post-processing in QMS or external software.