talking voltmeter

The four features of this tool include a talking voltmeter, logic probe, voltage averager, and frequency measurer.See:
http://people.ece.cornell.edu/land/courses/ece4760/FinalProjects/s2010/ab673_csb88/ab673_csb88/index.html
and
http://people.ece.cornell.edu/land/courses/ece4760/FinalProjects
and
http://people.ece.cornell.edu/land/courses/ece4760/Speech/index644.html