CK CL440 Skin Color Measurement Probe
| Brand | CK |
|---|---|
| Origin | Germany |
| Manufacturer Status | Authorized Distributor |
| Origin Category | Imported |
| Model | CL440 |
| Pricing | Upon Request |
Overview
The CK CL440 Skin Color Measurement Probe is a precision optical instrumentation module engineered for objective, repeatable, and metrologically traceable skin color assessment in dermatological research, cosmetic product development, clinical trials, and regulatory-compliant efficacy studies. It operates on the principle of diffuse reflectance spectrophotometry using a calibrated white LED illumination source arranged in a concentric annular configuration. This geometry ensures uniform incident illumination across the measurement aperture (typically 8 mm diameter), minimizing angular dependency and shadowing artifacts common in non-contact skin evaluation. The probe captures spectral reflectance data within the visible range (approx. 400–700 nm) and applies proprietary matrix-based spectral correction to align raw sensor output with CIE standard observer functions. All measurements are internally converted from raw RGB or XYZ tristimulus values into the perceptually uniform CIELAB color space (L* a* b*), enabling quantitative tracking of chromatic shifts—such as erythema reduction, melanin modulation, or post-inflammatory hyperpigmentation—across longitudinal study visits.
Key Features
- Annular white LED illumination system optimized for homogeneous skin surface irradiation and minimized specular reflection interference
- Integrated calibration routine compliant with CIE 15:2018 and ISO 13655:2017 spectral measurement standards
- Real-time conversion of measured XYZ tristimulus values to CIELAB (L* a* b*) coordinates per CIE Publication 15.3
- Automated calculation of Individual Typology Angle (ITA°) per Bernerd et al. (2001) methodology for standardized skin phototype classification
- Non-invasive, contact-free operation with adjustable standoff distance (recommended 10–15 mm) to accommodate anatomical curvature and avoid compression artifacts
- Rugged aluminum housing with medical-grade anodized finish; designed for repeated use in GLP- and GCP-aligned laboratory environments
Sample Compatibility & Compliance
The CL440 probe is validated for use on human facial and body skin sites—including forehead, cheek, inner forearm, and dorsal hand—under controlled ambient lighting (D65 illuminant simulation recommended). It excludes hair-covered, scarred, or heavily tanned surfaces unless pre-defined protocols account for such variables. The device complies with IEC 61000-4 electromagnetic compatibility requirements and meets CE marking criteria under the EU Medical Device Regulation (MDR 2017/745) Annex XVI for non-invasive aesthetic assessment tools. Data acquisition workflows support audit trail generation and user access control when interfaced with CK’s certified MPA software suite—enabling alignment with FDA 21 CFR Part 11 electronic record integrity requirements where applicable.
Software & Data Management
The CL440 operates exclusively via CK’s MPA (Multi Probe Adapter) software platform, which provides synchronized acquisition, visualization, and statistical analysis of colorimetric time-series datasets. Raw spectral reflectance curves, L* a* b* trajectories, ITA° trends, and ΔE*ab difference metrics are exportable in CSV, Excel, and XML formats. Software modules include batch processing, inter-subject normalization, baseline drift correction, and automated outlier detection based on standard deviation thresholds. All measurement sessions retain embedded metadata—including operator ID, timestamp, environmental lux/temperature logging (when paired with optional sensors), and instrument calibration certificate reference—ensuring full traceability for regulatory submissions and peer-reviewed publication.
Applications
- Objective quantification of skin lightening or darkening responses in clinical studies of depigmenting agents (e.g., hydroquinone, tranexamic acid, kojic acid)
- Monitoring UV-induced erythema kinetics and recovery timelines following controlled phototesting
- Standardized evaluation of sunscreen SPF validation protocols per ISO 24444:2019
- Assessment of pigmentary disorder progression in melasma, vitiligo, and post-inflammatory hyperpigmentation cohorts
- Quality control of topical formulations targeting color homogeneity, barrier repair, or anti-redness effects
- Supporting harmonized endpoint definitions in multicenter dermatology trials requiring cross-site colorimetric reproducibility
FAQ
Is the CL440 probe compatible with third-party spectrophotometers or data acquisition systems?
No—the CL440 is a closed-system probe designed exclusively for integration with CK’s MPA hardware interface and proprietary firmware. Interfacing with external DAQ systems is not supported.
What is the recommended recalibration interval for clinical use?
CK recommends annual factory recalibration against NIST-traceable standards, supplemented by daily verification using the supplied ceramic calibration tile (certified reflectance >99% at 550 nm).
Can the probe measure through transparent occlusive dressings or thin films?
No—measurements require direct optical access to the skin surface. Any intervening material alters scattering properties and invalidates CIELAB conversion algorithms.
Does the ITA° calculation account for ethnic variability in melanin distribution?
Yes—the ITA° algorithm is derived from multi-ethnic cohort data and correlates strongly with Fitzpatrick skin types I–VI without requiring subjective visual grading.
Is the device suitable for pediatric subjects?
Yes—its non-contact design and rapid single-shot acquisition (<100 ms) minimize motion artifact risk; however, age-appropriate consent and positioning protocols must be followed per local IRB guidelines.
