Use the following images to determine the version of your Colorimeter.
Sensor Booklet for 1995-2000 model:
Sensor Booklet for 2000-2014 model:
Sensor Booklet for current model:
The Colorimeters with the white BTA connector, available since 2000 will auto-identify when connected to a functional interface. The earlier box-shaped version used a 5-pin DIN connector and did not include the auto-ID feature.