MR TESTER is a multifunction diagnostic program that will check your system for hardware problems that may cause serious data loss or other types of hardware malfunctions. The diagnostics on this disk will test your disk drive, printer, keyboard, screen, SID music chip and many more hardware related functions. MR TESTER is easy and fun to use because it was written for maximum user friendliness. Please read this instruction booklet before embarking on ‘checking out’ your C-64.

Manual can be found HERE!