Yes, wireless. There was an interesting article on page 38 of the 21
October 2010 issue of the trade rag Machine Design
(http://www.machinedesign.com): "Wireless test indicator measures blind
holes", edited by Leslie Gordon:

http://machinedesign.com/article/inv...-test-indicato
r-measures-blind-holes-1021

In short, Bluetooth meets and marries the centenarian dial test
indicator.

Joe Gwinn