I’m uncertain if the Dentsply Midwest Caries ID has been discontinued; I would ask your dental supply rep directly about that. Here is a link that lists other caries detection devices:
http://www.ada.org/en/publications/ada-professional-product-review-ppr/archives/2015/vol_10_iss_2/caries-detection-devices
I did ask our rep and apparently it's been discontinued for 5 years! Makes me question why???? If it works so well then why would you discontinue it?
AToothFairy77