TechTool Deluxe is a reduced version of TechTool Pro that is supplied with AppleCare. The program can be updated to version 3.1.3, which is fully compatible with Snow Leopard:
Mine is version 3.1.2 and I'm still on 10.5.8 (till SL is 10.6.>1). Should I update now (i.e., is 3.1.3 still compatible with Leopard), or wait till after upgrading to SL?
There's no way out of here, When you're in here, you're here for good (David Gilmour)