A set of four 2.0 Wireless Mystrica colorimeters in a deep Gratnells tray with a lid and polyethylene foam insert.The set includes:40 x 4ml cuvettes80 x cuvette caps25 x 12mm glass test tubes4 x cuvette racks4 x USB cables4 x laminated instruction sheets2 x user manuals.This colorimeter has been developed by practising teachers to help teachers of science to deliver programmes of interesting and meaningful practical work. The instrument delivers high quality performance in a small robust user-friendly and affordable package. The unit can be used as a standalone colorimeter or be linked to a PC tablet or smart phone. The PC software and the IOS and android apps are free to download and use. The colorimeter makes colorimetry easily accessible to students of all ages across the curriculum. The combination of low cost ease of use and high performance make this an ideal instrument for use in schools and colleges. The colorimeter has a choice of wavelengths of light and can measure absorbance or transmittance. It can also be used for reaction kinetics.Technical Specification:Wavelength Range: 465-630nmLamp Source: LEDOptical System: Red Blue Green LEDPhotometric Range: 0 - 1.999A 0.0 - 100.0%TCuvette Holder: 10mm (12mm Test tubes can be used)Power Requirements: 4 x AA batteries (supplied)Compatibility: Via USB for PC Bluetooth for IOS Android smartphones and tablets