Colorimetry Research CR-250RH

The Colorimetry Research CR-250RH & CR-250 are compact, high-resolution spectroradiometers with a 4nm bandwidth and 1.6nm/pixel optical resolution.

  • ColourSpace INF/XPT/PRO & HTX/HTP
  • Large 20+mm Spot Size
  • 4nm Spectral Bandwidth
  • ±0.3nm Spectral Accuracy
  • 0.02 to 154,000 cd/m2
  • Solid Machined Aluminium & Stainless Steel Construction
CR-250RH + Shipping Ex. VAT (Shipping included)


Uniquely, the CR-250RH has a large 20+mm spot size, with small divergence angle, making it ideal for contact and non-contact measurement of all displays and projectors, and is designed for all display types, including projection and all luminous display technologies, in contact and non-contact modes.

Construction is extremely rugged, made of machined aluminium and stainless steel, with all optical components fixed to ensure no optical misalignment can occur, and weighs only 1 pound (0.45kg).

All CR-250RH probes are calibrated using NIST traceable calibration standards at a colour temperature of 2856 Kelvins, using a laboratory grade scanning double monochromator and high accuracy filters of known transmittance and chromaticity. Essentially, no other spectroradiometers are used during manufacturing and Q.A. because none of them are as accurate as a laboratory grade scanning double monochromator.


  • Detector: CMOS image sensor, 256 pixels
  • Spectral Range: 380–780 nm
  • Spectral Bandwidth: 4 nm
  • Spectral Accuracy: ±0.3 nm
  • Spectral Resolution: 1.6 nm / pixel
  • Luminance Range: 0.02-154,000 cd/m2
  • Luminance Accuracy: ±2 % (measured with NIST traceable 2856K light source, at 1.7 cd/m2)
  • Luminance Repeatability: ≤1 % (measured with NIST traceable 2856K light source, at 1.7 cd/m2)
  • Chromaticity Accuracy: ±0.0015 x,y (measured with NIST traceable 2856K light source, at 1.7 cd/m2)
  • Chromaticity Repeatability: 0.0005 x,y (measured with NIST traceable 2856K light source, at 1.7 cd/m2)
  • Polarization error: ≤0.5%
  • Digital Resolution: 16-bits
  • Objective Lens: 50 mm, 60 mm, 75 mm, 100 mm (50 mm is the standard lens - all others are special order)
  • Measurement Spot Size: 20mm at end of hood; 22.6mm at 100mm from hood
  • Spot Size Calculation: = 20mm +0.026*distance to object for 50mm lens
  • Custom Synchronisation: 10 - 10000 Hz
  • Exposure Time Range: 0.02 to 30 seconds
  • Power Requirements: 5V, 120 mA (600 mW) via USB 2.0
  • Interface: USB 2.0
  • Weight: 0.45 Kg

The CR-250RH has been designed specifically for the professional calibrator, providing a large spot size with contact measurement combined with a small divergence angle that keeps the measurement spot size within desired dimensions for distance calibration, as with projectors.

The rubber hood allows the probe to be positioned against screen surfaces, providing a shield for for stray ambient light.


  • USB 2.0 Cable
  • Universal Mounting Bar
  • Rubber Hood
  • Hard Carry Case (specify if 2nd CR probe being ordered)
  • Dual meter mount (free with 2nd CR probe)
  • Long reach meter mount extension bar (optional ~ £120)
  • Cosine/Illuminance Receptor (optional ~ £535)
  • ND Filters (optional ~ £535 each)
  • 3rd party Filter Holder (optional ~ £120)
  • Glasses Holder (optional ~ £730)
  • WiFi Box (optional ~ £565)
  • External Trigger Port (optional ~ £800)
  • Ethernet Connection (optional ~ £565)
  • RS-232 Port Connection (optional ~ £565)
  • Wavelength Check (optional ~ £505)

The Wavelength Check is a mercury gas light source, used in combination with the Colourimeter Utility to check the wavelength accuracy of the CR-250 and CR-300 range of spectroradiometers is within factory specifications.
(Note: For 120v/60Hz countries only.)

(ND filters and Cosine Receptors must be calibrated with the unit. If a ND filter or Cosine Receptor is purchased after the unit has shipped from the factory the unit must be shipped back to the factory in order to get the added accessory properly calibrated with the unit. Additionally, the Ethernet, RS-232 Port, and External Trigger Port require assembly at the factory, requiring existing CR probes to be returned to the factory.)


The CR-250RH or CR-250 should be factory recalibrated/re-certified every year to two years, depending on usage and storage, or when obvious issue are found (after physical shock to the probe for example).
Contact Colorimetry Research to schedule recalibration/re-certification.

Colorimetry Research Dual Probe Mount
Dual Probe Mount
CRI Android App

The CRI App will run on any Android phone/tablet, and will connect and control Colorimetry Research meters using a USB cable. All CR meters such as CR-100, CR-250, CR-300, etc. are low power devices and can be directly powered from the phone/tablet.


An alternate to the CR-250RH is the CR-250, for use with optional VO-201 Viewing Optics.

The CR-250 also comes with a removable Rubber Hood for contact use, and provides the same sensitivity and capabilities as the CR-250RH.

CR-250 & VO-201 + Shipping Ex. VAT (Shipping included)
Colorimetry Research CR-250
CR-250 & VO-201
Colorimetry Research Alternative Probes

Light Illusion can also supply any Colorimetry Research probe, or optional accessories.

Contact Light Illusion directly for further information.

ColourSpace Integration

As with all probes, operation and function is controlled via the Probe Options menu, accessed via the Profiling window, with the left-hand side of the menu providing generic probes settings, and the right-hand side settings specific to the CR-250.

CR-250 & CR-300

CR-250/300 Settings

The Settings options provide specific CR-250 configurations. Full details for all options can be found within Colorimetry Research's own documentation.

Exposure Mode

Exposure Mode specifies the exposure setting for measurements, with Auto and Manual being the two options available.


Exposure sets the maximum exposure time for any given reading in Manual modes, from 20.58 msec up to 30 sec.


Averages the exposure based on the specified multiplier.


Sync defines the sync frequency of the probe, with None being the default, although Manual can be used if the refresh rate of the display is known. Alternatively, the TV standard presets can be used as required.


Slow: For low light measurements
Normal: Standard measurements
Fast: Fast measurements
2xFast: Twice the speed of Fast


Shows the Aperture used.


The Accessory option selects the current Accessory for capturing Measurements, such as the Cosine/Illuminance Receptor.

Filter 1, 2, & 3

The three Filter options define any ND (Neutral Density) Filters in use, up to a maximum of 3 individual filters.


The Drop-down menu provides access to any Colour Matching Functions held within the CR-250.
Colour Matching Functions are aimed at correcting for Metameric colour failure, such as via CIE Judd-Voss 1978, CIE 170-2:2015 2°, and the default CIE 2006.

Average Low Light

Average Low Light is a probe generic option, that averages multiple readings in low-light situations using an advanced algorithm built into ColourSpace. The algorithm varies based on the probe in use to provide the best possible results.

Probe Adjustments

Probe Adjustments are generic probes settings, with consistent operation regardless of the probe in use.

Configure Matching

Probe Matching is really unnecessary with the CR-250, as it is a Spectroradiometer.
The options is provided on a Why Not basis...


Probe Offset enables a user to manually enter offset values for different probes/display combinations.
Perceptual Colour Match is a preferable approach.

Extra Delay

Extra Delay sets a delay time after the patch has changed before probe measurement starts, and can be set automatically via the Auto button, and manages signal path delays in the image pipeline.
When using the Auto option, Average Low Light not be enabled.