This is the PEM2 100 mm extension bar # A-1076-0071. 

PEM multiwired extension bars, available in three lengths, extend the reach of autojointed probes. They are designed to be used with all multiwired probes SP25M and SP600M scanning probes as well as third party optical probes).

The PEM2 is suited to the majority of applications that require an additional 100 mm of reach.

Compatible heads:

• PH10M PLUS
• PH10MQ PLUS
• PH10M-IQ PLUS
• PH6M

Compatible probes:

• SP25M
• TP6A
• TP7M
• Third-party probes