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CO7500 Colorimeter


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The CO 7500 is a value for money instrument that has been designed for use in educational establishments including sixth form colleges, secondary schools, technical schools and colleges.

With a large, uncluttered, digital display and simple push button controls, the instrument is ideal for students. The unit is compact and robust enough to withstand the rigours of the teaching environment, and is available in mains only or mains /internal rechargeable NiMH battery versions.

The CO 7500 is easy to use. The eight filters – 440, 470, 490, 520, 550, 580, 590 and 680nm – are encased in an integral filter wheel and the wavelength required is obtained by rotating this until the relevant, colour coded, number is visible in the indicator window. The ergonomic design makes this very convenient, and filters cannot be accidentally lost or damaged. With only five buttons (on/off, reference and test, convert between Absorbance and % Transmission readings and kinetics), the instrument is ideal for beginners. When used in kinetics mode - to study rates of reaction, for example - the CO 7500 takes readings approximately every second and these can be sent to a chart recorder (via the analogue output) if required. Alternatively, the results could be downloaded to an Excel spreadsheet for graphing and other manipulation using the appropriate accessories.

The samples can be measured in either standard 10mm pathlength cuvettes a minimum of 400 µl is required or in 16mm diameter test tubes (adapters for 10/12 mm test tubes are an optional accessory with the CO 7500);. There is a drain hole at the bottom of the cell compartment so that spillages do not affect the instrument.


  • Single beam filter based colorimeter covering 440-680nm
  • Rugged, portable and easy to use
  • Excellent value for money and ideal for educational applications.
  • Absorbance, %Transmission and simple kinetic measurements
  • Rechargeable battery version available


  • Designed for science education
  • Versatile
  • Low maintenance


Wavelength selection: 8 gelatin filters
Type: Visible
Wavelength Range: 440 - 680nm 
Wavelength Accuracy (+/-): n/a
Wavelength Reproducibility (+/-): n/a
Light source: Tungsten Halogen
Beam: Single Beam
Optical System: Filters
Bandwidth: 40nm
Detector: Diode
Photometric Range: -0.3 to 1.99A, 0-199%T 
Photometric Range: <+/- 0.05A at 1A using neutral density filters
Stray Light: <1%T at filter wavelength
Stability: n/a
Spectral Scanning: No
Measurement Type: Fixed Wavelength (Abs/%T), kinetics 
Cell Compatibility: Cuvette 10mm
Other Sample Containers: Test tube (10,12,16mm)
Cell Holder: Single Cell
Accessory Options: Printer
Temperature Control: None
Method Storage: n/a
Regulatory Compliance: CE
Printer: Serial*, External via Export*, Chart Recorder* 
Data Output: Print*, Export to PC* 
Display: LCD
Export/ Data Storage: Serial Cable
Data Interface: Serial, Analogue 
Languages: English, Manuals in French, German, Italian and Spanish
Power Requirements: 110-220V, 50/60Hz, 20VA
Weight: 0.6 Kg (1.2lb)
Dimensions: 15 x 18 x 6cm (5.9 x 7.1 x 2.4 inches)
Certification: CE