There are three models of Vernier Colorimeters. The first model (rectangular shape) has three wavelength settings, the second model (a rounded shape) has four wavelength settings, and the third model (released in 2015) is a rectangular shape with four wavelength settings. The two most recent models are auto-ID sensors and support automatic calibration (pressing the CAL button on the Colorimeter with a blank cuvette in the slot).
If your Colorimeter does not have a CAL button, use the instructions in the document below to calibrate your Colorimeter.
If you are using EasyData for data collection, Vernier can provide you with Experiment AppVars for the Colorimeter. Please contact Vernier if you are interested in obtaining this file.