Particle Count Test by Outside Vendor

GOOD VALIDATION PRACTICE (cGVP)
1

Hello folks,
When looking for an outside vendor to do the particle count on clean areas, should the vendor has some certification? Or it is enough if the test reports comply with ISO14644-1?

Comments are greatly appreciated.

2

The particle counter should comply with the requirements mentioned in Annex C of 14644-3

VEERRAJU