This seems to be a standard commercial device that has many applications and is not part of the missiles but a tool used in calibration. The article mentions th

This seems to be a standard commercial device that has many applications and is not part of the missiles but a tool used in calibration. The article mentions the Leica Builder T100/T200, a quick Google shows that there are several used ones available on eBay for about £600 here in the UK, so they are not exactly restricted devices... Not sure what the Chinese could have done to them. If they tempered with the device to give inaccurate measurements it would be quickly detected... an hidden tracking device to see where they are used in Taiwan? But that implies that they knew which specific devices would eventually be sent back to the Taiwanese military.