The CM-2500c is a compact portable spectrophotometer with 45°a:0° geometry defined and standardised for colour measurement in several applications such as automotive interior materials, high visibility textiles, Coatings and Road marking.

Furthermore, this geometry is renown of providing colour values having an excellent match with visual perception by fully excluding surface conditions by gloss or texture.

The perfect annular optical system of the CM-2500c (defined as 45°a:0°) achieves unsurpassed accuracy and repeatability, especially on textured or structured surfaces, regardless of measurement direction.

The CM-2500c body is light-weight and compact allowing one hand operation with a minimum of operation keys. The large information display shows measurement data either numerically or graphically.


Model CM-2500c
CM-2500c CT
Illumination / Viewing system 45°a:0° method (45° annular illumination, 0° vertical viewing) Conforms to the following norms: CIE 15, ISO 7724/1, ASTM E179, DIN 5033 Part 7 and JIS Z 8722
Light-receiving element Silicon photodiode array (dual 40 elements)
Spectral separation device Diffraction grating
Wavelength range 360 nm to 740 nm
Wavelength pitch 10 nm
Half bandwidth Approx. 10 nm
Reflectance range 0 to 175%, resolution: 0.01%
Light source 2 pulsed xenon lamps
Measurement time Approx. 1.5 seconds
Minimum interval between measurements 4 seconds
Battery perfomance Alkaline manganese: approx. 1000 measurements (at 23°C)
Measurement/ illumination area Ø 7 mm / Ø 11 mm
Repeatability Colorimetric Value: Standard deviation within ΔE*ab 0.05 (Measurement conditions: White calibration plate measured 30 times at 10-second intervals after white calibration was performed)
Inter-instrument agreement Within ΔE*ab 0.25 (Average for 12 BCRA Series II color tiles compared to values measured with master body at 23°C) Within ΔE*ab 0.15 (Average for 12 BCRA Series II color tiles compared to values measured with master body at 23°C)
Measurement mode Single measurement/automatic averaging of multiple measurements (auto mode: 3, 5, 8 times/manual mode)
Interfaces RS-232C standard
Observer condition CIE: 2° and 10° standard observer
Illuminant condition CIE: A, C, D50, D65, F2, F6, F7, F8, F10, F11, F12 (simultaneous evaluation is possible using two light sources)
Displayed data Spectral value/graph, colorimetric value, color difference value/graph, PASS/FAIL result
Colour spaces / colourimetric data L*a*b*, L*C*h, CMC(1:1), CMC(2:1), CIE94, Hunter Lab, Yxy, Munsell, XYZ, MI, WI (ASTM E313), WI (CIE), YI (ASTM E313/ASTM D1925), ISO Brightness (ISO 2470), Density status A/T, WI/Tint (CIE), CIE 00
Data memory 700
Pass/Fail judgment Tolerance for colour difference (Both box and elliptical tolerances can be set)
Power source 4 AA-size batteries or AC adapter
Dimensions (W x H x D) 69 × 96 × 193 mm
Weight Approx. 670 g (without batteries)
Operating temperature/ humidity range 5 – 40°C, relative humidity 80% or less (at 35°C) with no condensation
Storage temperature/ humidity range 0 – 45°C, relative humidity 80% or less (at 35°C) with no condensation
Standard accessories White calibration plate, RS-232C cable, AC adapter, AA-size battery (×4)
Optional accessories Hard case, Dust cover set, Dust cover, SpectraMagic™NX (software), Zero calibration box.

Specifications are subject to change without prior notice.