Also check out Handheld Scientific's BT-600 http://handheldsci.com/kb/ http://handheldsci.com/kb/ Be sure to read their documentation which includes a fair am

Also check out Handheld Scientific's BT-600 http://handheldsci.com/kb/ http://handheldsci.com/kb/ Be sure to read their documentation which includes a fair amount of macro programming.