Ron Schmuck asks for an instrument tuner.  I can recommend the Korg
CA-30.  This is a fully chromatic tuner that can be adjusted from A-440
down to A-410 and up to A-480 in 1 Hz intervals.  This is ideal for
most musical instruments made back into the 19th Century.  It only
does equal temperament but that shouldn't concern the majority of us.
I bought mine from a well known on-line music and book store for less
than 10 GBP.

Nicholas Simons, UK