Hello
You might want to also check out the Microm.We have a Microm automatic microtome and it is retractable using a touch pad. THere is also a totally automatic Microm microtome to which I will be trying out within the next few months. I received all the information from Robert A. Jacox @ 1-800-522-7270 X 623
email @  rjacox@rallansci.com 
Richard-allan Scientific, we have been very pleased with our microtome. I hope this helps.
Sandi Miller HT
USAMRICD Research
Md