This is something that surprised me a bit. Last summer the NFB and NASA did a
space camp for high schoolers. At that time, Omega refused to sell the NFB
talking multimeters to use in the NASA camp due to danger to blind people. For
some reason the NFB apparently did not follow that up last year. They have said
they're interested in following this up because of their experiences and have
been in contact with Omega so far to no result.
Tom
Tom Brennan KD5VIJ, CCC-A/SLP
web page http://titan.sfasu.edu/~g_brennantg/sonicpage.html