A measurement probe for a machine tool has a housing incorporating a window that allows the optical transmission or receipt of signals from/to infrared transmitters or receivers. To obviate the need to mount the transmitter and receiver components on an external surface of the housing, they are surface mounted to a circuit board.
This is a Continuation of application Ser. No. 09/959,206 filed Oct. 22, 2001, which in turn is a National Stage of application Ser. No. PCT/GB01/00878 filed Mar. 1, 2001. The entire disclosure of the prior application is hereby incorporated by reference herein in its entirety.
