Tracking without cookies

I've created a simple script after discussions on a mailing list I'm a member of. The idea was to create a unique identifier without using a full IP address or cookies. It works using javascript to gather information about the browser (screen depth, user agent etc), it then takes all this information and creates a unique hash and returns the length of the hash to create the identifier (between 10-32 characters).

The script assumes the target user would only use one browser and have javascript enabled, I'm not sure if it could be used for production code but I thought it was worth looking into and any feedback would be helpful.

Probe POC