This info is for anyone else with a Ilford Multigrade 500 system I have found at http://www.users.zetnet.co.uk/ktphotonics/news.html that they are releasing an Analyser Pro that will control this head. It is not quite finished, but it looks like the price will be the same as the Analyzer Pro. Once it is done I plan on purchasing it. It should work much better than the probe that comes with the Ilford system.