http://www.ika.net/owa/ika/catalog.accessory_data?iProductgroup=188 (http://www.ika.net/owa/ika/catalog.accessory_data?iProductgroup=188)
Guess the ide is a biit old
(My electronic friend once build one siple one, a small chip and a thermoresistant. guess the price was a dollar or so. Why cost those ika thing 5-800euro ?)