67Ghz Cascade Z probe 250um pitch. 1.65mm connector. Usually reserved in pair. They are stored in the black cabinet, door #16 in room A2550. You need to have access to the Trakka system. Make sure you take a picture of the probe tips when you finish using them. You can do it by moving the probe close one to the other (like you would do to do the calibration) and take a picture of the screen with your cell phone.