We have TWO! MJ minicyclers and use them for anything, everything that needs a temperature other than room. One is 3? years old, still great, the other is 6 mos. old. No hot lid, we still use mineral oil. John Hess, PhD Phone me 916 752 8420 Dept of Human Anatomy FAX me 916 752 8520 University of Calif Email me jfhess at ucdavis.edu Davis, CA or leave me alone, your choice.